Author: Speed Cooking

There is a good chance you have eaten it without knowing what it was. Daikon turns up on a Japanese menu in at least four different forms, and they look so unlike one another that most people never connect them.

What is daikon?

Daikon is a large white radish, long and cylindrical, common across East Asia. The name means big root, which is a fair description – a full one can be the length of a forearm.

It is the same species as the small red radishes in a salad; Britannica’s entry on the radish covers how wide that family runs. The difference is size, water content and a much milder flavour.

What it tastes like

Mild, faintly sweet and juicy, with a peppery edge that is strongest near the top of the root and fades toward the tip. Raw, it is crisp and refreshing. Cooked, it turns soft and almost translucent and loses the pepper entirely.

If you know small red radishes, daikon is a much gentler version of the same idea. It is watery rather than dense, and it takes on the flavour of whatever it is cooked in.

How a kitchen prepares it

Almost every form starts with peeling, because the skin is tougher and more peppery than what is underneath. Beyond that the preparation is what determines which of the four things it becomes.

The fine white threads are cut on a specialised tool – or, in a kitchen that does it the traditional way, by rotating the peeled root against a knife to take off one continuous sheet, which is then stacked and shredded. It is a display of knife work as much as a preparation.

Grated daikon is made on a fine grater and then drained briefly, since it releases a great deal of water. Too wet and it floods the plate; squeezed too hard and it loses the juiciness that makes it refreshing.

The four forms you will meet

Form	What it looks like	Where it appears
Pickled	Bright yellow discs or strips	Inside rolls, beside rice
Grated	A small wet white mound	Beside fried food and grilled fish
Shredded raw	Fine white threads	Under sashimi, in salads
Simmered	Soft translucent chunks	In stews and hot pots

The first three all turn up on a sushi menu, and none of them look like a radish by the time they reach the plate.

The yellow pickle

The bright yellow discs are takuan, daikon that has been dried and then pickled. It is sweet, sour, extremely crunchy and coloured far more vividly than anything natural.

On a sushi menu it turns up inside simple rolls, where its crunch and sharpness do the job that a raw vegetable would otherwise do. It is also served in small amounts beside rice, where it functions as a palate reset between mouthfuls.

The white mound beside fried food

Grated daikon appears next to fried and grilled dishes, sometimes with a little soy poured over it, sometimes with grated ginger mixed through. It looks like a garnish and is not one.

Its purpose is to cut richness. Grated raw radish is watery, faintly peppery and cold, and a small amount of it between bites of something fried resets the palate completely. Eating it as an accompaniment rather than leaving it on the plate makes a real difference to a fried dish.

The white threads under sashimi

Finely shredded raw daikon is the bed that sliced raw fish is often presented on. This one genuinely is partly presentation – it holds the slices up and keeps them separated – but it is also perfectly edible and does the same palate-clearing job.

It is worth eating rather than pushing aside. Cold, crisp and neutral, it works between different fish in the same way pickled ginger does.

Which end of the root

A whole daikon is not uniform, and cooks use different parts for different things. The top, nearest the leaves, is the sweetest and mildest, so it goes into salads and raw preparations.

The middle is the most balanced and is the usual choice for simmering. The tip is the most peppery and the most fibrous, which makes it the part most often grated, where a bit of bite is wanted.

This is why the same vegetable can seem sharp in one dish and almost sweet in another even when nothing else has changed.

Simmered daikon

Cooked slowly in a seasoned broth, daikon becomes something else entirely – soft, translucent, and saturated with whatever it was cooked in. The pepperiness disappears and what is left is texture and absorbed flavour.

This is the form least likely to appear on an American Japanese menu, but it is worth trying if you find it, because it demonstrates how completely the same vegetable can change character.

Choosing one

If you go looking for daikon rather than meeting it on a plate, a few things separate a good root from a tired one. It should feel heavy for its size, which means it has not dried out, and the skin should be smooth and unblemished rather than wrinkled.

Stored whole and wrapped, it keeps for a couple of weeks in a fridge. Once cut it dries quickly at the exposed face, so the usual approach is to keep the cut end covered and work through it rather than portioning it all at once.

How to spot it

A few reliable signals, since it is rarely named on a menu.

• Bright yellow crunchy discs – pickled daikon, almost always.
• A wet white mound beside something fried – grated daikon.
• Fine white threads under raw fish – shredded raw daikon.
• “Pickled radish” in a roll description – the same thing, named plainly.

The leaves are food too

A daikon sold with its greens attached comes with a second vegetable. The leaves are peppery and slightly coarse, closer to a mustard green than to a lettuce, and they are cooked rather than eaten raw.

You will not meet them on a restaurant menu often, since daikon usually arrives at a kitchen already trimmed. They are worth knowing about mainly as a reminder that the root you see is one part of a larger plant.

Why it works so well with rich food

Almost every use above is doing the same job from a different angle. Daikon is mostly water, it is cold in three of its four forms, and it carries either acidity or a mild pepperiness.

Those are precisely the qualities that cut through fat and salt. A cuisine that serves a lot of fried food and a lot of rich fish needs something that resets the palate cheaply and quickly, and this is it.

For where it turns up, our beginners guide to rolls covers the vegetable fillings, the fish-free guide leans on vegetable rolls heavily, and the condiments guide covers the other palate-clearing item on the table. The current selection is on the ordering page.

Frequently Asked Questions

What is daikon?

A large white radish common in East Asian cooking. It is mild, juicy and faintly peppery, and much gentler than the small red radishes it is related to.

What is the yellow pickled thing in my sushi roll?

Almost certainly takuan – pickled daikon. It is sweet, sour and very crunchy, and the colour is added rather than natural.

What is the white mound served with fried food?

Grated daikon. It is there to cut richness between bites, not as decoration, and it is meant to be eaten.

Are the white threads under sashimi edible?

Yes. They are finely shredded raw daikon, and they do the same palate-clearing job as pickled ginger.

Does daikon taste like a radish?

Mildly. It has a peppery edge raw, strongest near the top of the root, but it is far less sharp than a small red radish and loses the pepper entirely when cooked.

Avocado is in a remarkable proportion of the rolls on an American sushi menu, and it is not a Japanese ingredient. How it got there, and why it stayed, is a better story than the usual explanation that people simply like it.

The short answer

Avocado entered sushi as a substitute for fatty tuna. It was reached for because it does something similar in the mouth – rich, soft, mild – and because it was available when good fatty tuna was not.

It stayed because it turned out to solve several problems at once, only one of which was flavour.

Where it came from

The standard account places it in North American sushi kitchens in the 1960s and 1970s, where chefs were working for diners who were unenthusiastic about raw fish and seaweed on the outside of a roll.

The roll built to solve that – crab, cucumber and avocado, with the rice turned to the outside – is the direct ancestor of an enormous share of what is on menus now. The avocado was the part doing the work that fat would otherwise have done.

What it actually does in a roll

Three things, and they are worth separating.

• Richness. Rice, seaweed and lean fish are all fairly lean. Avocado supplies the fat that makes a mouthful feel complete.
• Texture. It is soft without being wet, so it fills space in a roll without making the rice soggy the way a watery ingredient would.
• Structure. Sliced firm, it holds its shape when a roll is cut, which is why it can be laid over the top of a roll and still look like anything.

The third of these is the underrated one. A great many toppings collapse under a knife. Avocado at the right ripeness does not, and that is why it is draped over so many specialty rolls rather than just hidden inside them.

Ripeness is the whole game

Avocado has a narrow window, and a kitchen’s handling of it tells you a lot. Too firm and it is waxy and tasteless, with a sharp edge where it should be soft. Too ripe and it turns to paste, greys at the surface and cannot be sliced at all.

Britannica’s entry on the avocado notes that the fruit ripens after picking rather than on the tree, which is exactly why the window is so awkward to manage – the ripening is happening in the kitchen’s store room rather than in a field.

How to tell whether it is being handled well

1. Look at the colour. Bright, even green means it was cut recently. Grey or brown edges mean it was sliced well ahead.
2. Look at the slices. Clean, even, distinct slices mean the right firmness. Ragged edges or a smeared look mean overripe.
3. Check whether it holds its shape on top of the roll. Slices that have flattened into each other were too soft when they went on.
4. Taste for the sharp note. A faint bitterness at the edge means it was cut before it was ready.

How kitchens stop it browning

Cut avocado discolours quickly, and how a kitchen deals with that is one of the clearest signals of how it works generally.

The reliable method is simply to cut it to order, which is why the best rolls arrive with slices that are evenly bright. Where volume makes that impractical, a little acid – lemon or the vinegar from the rice seasoning – slows the browning without changing the flavour much.

What does not work is preparing it far ahead and covering it, which is why grey edges are worth noticing. They do not make a roll unpleasant, but they tell you the avocado was sliced a while before it reached you.

Avocado and fatty fish compared

	Avocado	Fatty fish
Mouthfeel	Rich and smooth	Rich and smooth
Flavour	Very mild, faintly nutty	Distinct, savoury
Behaviour when cut	Holds shape if firm enough	Holds shape
Availability	Year-round and consistent	Varies by season and supply
Role in a roll	Adds body without competing	Is the point of the roll

The comparison explains both why the substitution worked and why it is not really a substitution any more. Avocado is now an ingredient chosen for itself, in rolls that were never going to contain fatty tuna in the first place.

Is it traditional?

No, and it is worth being straightforward about that. Avocado has no history in Japanese sushi and is not native to Japan. What it has is around half a century of history in sushi as it is actually eaten across North America.

Whether that counts as tradition depends on where you draw the line, but the practical answer is that a menu without it would look strange to almost everyone ordering from it.

When there is too much of it

The honest criticism is that avocado is sometimes used to pad. It is cheaper than fish, it fills space, and it is popular enough that few people complain, so a roll can end up being mostly rice and avocado with a token amount of anything else.

You can see this in the cut face of a roll. If avocado occupies more of the cross section than the named filling does, the roll is leaning on it. That is not necessarily bad – plenty of avocado-forward rolls are good – but it is worth noticing when the menu named something else.

Where else it turns up

Once it was established in rolls, avocado spread across the rest of the menu, and it now appears in places that have nothing to do with sushi at all.

• Salads – sliced or cubed, where it does the same job of adding richness to something lean.
• Rice bowls – laid over the top, for the same reason it works on a roll.
• As a topping – fanned over cooked dishes where a cool, soft element is wanted against something hot.

The pattern is consistent everywhere it appears. It is being used for texture and richness rather than for its own flavour, which is mild enough that it rarely leads a dish.

Ordering with it in mind

If you like avocado, look for rolls where it is on top rather than inside. Sliced over the outside it is the first thing you taste, and a kitchen that presents it that way is confident about its ripeness.

If you are indifferent to it, the vegetable and simpler fish rolls generally use less of it, and asking for a roll without it is a normal request that most kitchens will accommodate.

For how these rolls are put together, our beginners guide to rolls covers the basics, the specialty rolls guide explains the layered construction avocado is usually part of, and the cooked and raw guide helps if you are avoiding raw fish. The current selection is on the ordering page.

Frequently Asked Questions

Why is there avocado in sushi?

It was adopted in North American kitchens as a stand-in for fatty tuna, because it gives a similar richness and softness. It stayed because it also holds its shape when a roll is cut.

Is avocado traditional in Japanese sushi?

No. Avocado is not native to Japan and has no history in traditional sushi. It has roughly half a century of history in North American sushi.

What does avocado do in a roll?

It supplies richness, fills space without making the rice wet, and – when sliced at the right firmness – holds its shape well enough to be laid over the top.

How can I tell if the avocado is good?

Look for bright even green and clean distinct slices. Grey edges mean it was cut too far ahead; a smeared look means it was overripe.

Can I order a roll without avocado?

Usually yes. It is a common request and most kitchens will accommodate it, though it is worth asking rather than assuming.

The tiny orange beads on the outside of a roll are one of the most recognisable things on a sushi menu and one of the least explained. There are two of them in common use, they come from different fish, and telling them apart is easier than it sounds.

The short answer

Tobiko is flying fish roe. Masago is capelin roe. Tobiko is slightly larger, firmer and audibly crunchy; masago is smaller, softer and generally the less expensive of the two.

Both are used the same way – rolled onto the outside of a roll, spooned on top, or scattered as a garnish – and on a menu they are frequently used interchangeably.

What tobiko is

Tobiko comes from flying fish, the species that escape predators by gliding above the surface of the water; Britannica’s entry on flying fish describes how far they can travel that way.

The eggs are around a millimetre across, firm enough to pop distinctly between the teeth, and naturally a bright red-orange. That texture is the reason tobiko is used on the outside of a roll rather than inside it – the contrast against soft rice is the whole point.

What masago is

Masago comes from capelin, a small cold-water fish that spawns in enormous numbers in the North Atlantic and North Pacific; Britannica’s entry on capelin covers the scale of those runs.

The eggs are smaller than tobiko and softer, closer to a fine paste when a spoonful is pressed. Naturally they are a duller yellow-orange, so they are usually coloured to reach the orange most people expect.

Because capelin is caught in such quantity, masago is the cheaper of the two, which is why it turns up far more often in high-volume kitchens.

The two compared

	Tobiko	Masago
From	Flying fish	Capelin
Size	About 1mm, individually visible	Smaller, closer to a paste
Texture	Firm, pops distinctly	Soft, yields quietly
Natural colour	Bright red-orange	Dull yellow-orange
Usually	Used as-is or dyed for effect	Coloured to a standard orange
Cost	Higher	Lower

How it is prepared

Neither roe arrives at a restaurant in anything like its natural state, and the processing explains most of what you taste.

1. The roe sacs are separated and the eggs are washed free of membrane.
2. They are brined, which firms them and is where most of the saltiness comes from.
3. They are seasoned – soy, sometimes mirin or a little sugar, varying by producer.
4. They are coloured, if the natural shade is not what the market expects.
5. They are chilled and kept cold, because both are served cold and neither is cooked.

This is curing rather than cooking. Nothing is heated, which is why both keep their distinct texture, and why both are always served straight from the fridge.

How to tell them apart on a roll

Three checks, in order of reliability.

1. Listen. Tobiko makes a faint crackle as you bite; masago does not.
2. Look closely at the surface. If you can pick out individual beads at arm’s length, it is tobiko. If the coating reads as a single textured layer, it is masago.
3. Feel it against the roof of your mouth. Tobiko stays separate; masago flattens.

Colour is the least useful signal, because both are routinely dyed. A jet-black or vivid green coating is a coloured roe rather than a different species.

The bigger orange pearls are something else

There is a third roe that is often confused with these two and is not remotely the same thing. If the beads are large – four or five millimetres, glossy, individually distinct and translucent – that is salmon roe, usually called ikura.

The difference is obvious once you have seen them together. Salmon roe is eaten a spoonful at a time, typically on its own piece of sushi, and it bursts rather than crunches.

It is also a different experience to eat. Tobiko and masago are textures added to something else; salmon roe is the dish. If a menu lists a piece topped with large orange pearls, it is not offering you a garnish.

What they taste like

Less fishy than people expect, and much saltier. The dominant note in both is the brine, followed by a mild savoury sweetness from the seasoning, with the sea flavour a long way behind.

Tobiko has a slightly cleaner finish and a faint smokiness in some versions. Masago is a little more assertive and a little saltier, which is partly why it works well as a coating spread thin across a whole roll rather than concentrated in one place.

If you have avoided both on the assumption that fish eggs taste strongly of fish, the assumption is worth testing on a single piece.

The coloured versions

Both roes take dye readily, and kitchens use that.

• Black – coloured with squid ink, used where a dark outer coating is wanted.
• Green – coloured with wasabi, which adds a faint heat as well as the colour.
• Red – a deeper shade than the natural orange, sometimes with a chilli element.
• Yellow – coloured with yuzu, adding a citrus note.

These are presentation choices rather than different ingredients. If the flavouring matters to you – the wasabi green in particular – it is worth asking, because the colour alone does not tell you whether it is a dye or a seasoning.

Why it is always cold

Both roes are cured rather than cooked, which means temperature is doing real work rather than being a serving preference. Warm roe loses its pop almost immediately and the texture is most of what you are paying for.

This is worth knowing when ordering to take away. A roll coated in roe is not ruined by the trip, but it is noticeably better eaten soon after it is made, and it should not be left sitting out once it arrives.

How menus name it

Menu wording is inconsistent, and a few conventions are worth recognising. Some menus name the roe directly as tobiko or masago. Many simply write “roe” or “fish roe” and leave it there. Masago is also sometimes listed as smelt roe, which is a naming convention rather than a different ingredient.

Where the menu does not say, the safe assumption in a high-volume kitchen is masago, because it is the cheaper of the two and the one used at scale. If it matters to you, the texture will tell you within one bite.

Why rolls are coated in it at all

Beyond appearance, the coating does two useful things. It gives a soft roll a textural edge, and it stops the outside of the rice sticking to the plate, to the chopsticks and to the next piece.

That second function is why you see it most on rolls with the rice on the outside. A roll wrapped in seaweed does not need it; a roll with exposed rice benefits from almost anything on the surface, and roe happens to look striking while doing the job.

If you want to know why house rolls are built with these outer layers in the first place, our specialty rolls guide covers the construction, the beginners guide explains the basics, and the piece on crab mix covers the other component you will find in almost every one. The current selection is on the ordering page.

Frequently Asked Questions

What is the difference between masago and tobiko?

Tobiko is flying fish roe – larger, firmer and audibly crunchy. Masago is capelin roe – smaller, softer and less expensive. They are used the same way.

Is masago just cheap tobiko?

They come from different fish. Masago is cheaper because capelin is caught in far greater quantity, not because it is a lesser grade of the same product.

Why is the roe on my roll green or black?

It has been coloured – squid ink for black, wasabi for green, yuzu for yellow. The underlying roe is the same, though wasabi green does add a little heat.

Are the big orange balls on sushi the same thing?

No. Those are salmon roe, usually called ikura. They are several times larger, translucent, and burst rather than crunch.

Is the roe raw?

It is cured rather than cooked – brined and seasoned. It is not heat-treated, and it is served cold.

Spicy tuna is on more American sushi menus than almost anything else, and it raises two questions that the menu never answers. Is it raw, and how spicy is spicy? Both have clear answers.

What is spicy tuna?

Spicy tuna is raw tuna, chopped or minced, mixed with a chilli-based sauce and used as a filling. It is not a cooking method or a cut of fish – it is a preparation, made in the kitchen and then rolled, scooped or spooned into whatever it is going into.

Because it is a mixture rather than a single ingredient, it varies more between restaurants than almost anything else on a sushi menu.

Yes, it is raw

This is the part that catches people out. The chilli sauce reads as cooking to some diners, and the mixture’s texture makes the fish less obviously raw than a clean slice would be. Neither changes what it is.

If you are avoiding raw fish, spicy tuna is not the compromise it appears to be. Tuna is one of the most widely eaten raw fish in the world – Britannica’s entry on tuna covers how many species carry the name – and the spicy version is simply that fish with a sauce through it.

How spicy is it, really

Mild, by the standards of anything actually described as spicy. The heat is there to be noticed rather than to be a challenge, and in most kitchens it sits well below what a chilli-forward dish would deliver.

There is a practical reason for the restraint. The fish is expensive and delicate, and a sauce hot enough to dominate would waste it. What the chilli is doing is adding warmth and a little sharpness to something that is otherwise very soft and very rich.

If you want to know where a particular kitchen sits, the reliable question is not “is it spicy” but “how hot do you make it”. Kitchens vary, and they know it.

What is actually in the mix

The components are consistent even though the proportions are not.

• Tuna – chopped, minced or scraped, depending on the kitchen and the cut being used.
• A chilli element – usually a chilli paste or chilli-based hot sauce.
• Something creamy – most often a mayonnaise, which carries the heat and binds the mixture.
• Sesame oil – a small amount, common but not universal.
• Scallion – chopped fine, for sharpness and colour.

The creamy element is the one people are most surprised by, and it is the reason spicy tuna is softer and richer than plain tuna. It is also why the mixture holds together well enough to be rolled.

Chopped, minced or scraped

How the fish is cut changes the result more than the sauce does. Chopped tuna keeps distinct pieces and a firmer bite. Minced tuna is smoother and more uniform. Scraped tuna – taken from close to the bone or the skin – is the softest of the three and almost paste-like.

None of these is a lesser version. Kitchens choose based on what they are making: a firmer mix suits a hand roll, where the filling needs structure, while a smoother one spreads more evenly through a cut roll.

Why the preparation exists at all

There is a practical reason spicy tuna is on every menu, and it is not only that people order it. A tuna loin does not break down into uniform slices. There are trimmings, there is meat close to the sinew, and there are pieces too small or too irregular to serve on their own.

Chopping and seasoning turns all of that into something with a use. That is not a shortcut – it is the same logic that produces a great many good dishes, and it is why the preparation exists in kitchens that take their fish seriously as well as in ones that do not.

It also means quality varies with what a kitchen has been cutting. A restaurant slicing a lot of tuna has good trimmings to work with; one buying pre-cut fish has to make the mixture from something else.

Spicy tuna and other common fillings

	Spicy tuna	Plain tuna	Crab mix
Raw or cooked	Raw	Raw	Cooked
Form	Chopped and mixed	Sliced or in a strip	Shredded and dressed
Texture	Soft, slightly loose	Firm and clean	Firm and even
Flavour	Rich, warm, savoury	Clean and direct	Mild and faintly sweet
Heat	Mild warmth	None	None
Suits	Rolls and hand rolls	Nigiri and simple rolls	Rolls and salads

The comparison worth drawing is with plain tuna rather than with other spicy things. The question is really whether you want the fish to lead or the seasoning to.

How to tell a good one

A few things separate a well-made spicy tuna from a poor one, and none of them require any expertise.

1. The colour should be deep red or pink running through the mixture, not uniformly orange. Orange throughout means a lot of sauce and not much fish.
2. It should hold its shape when the roll is cut. A filling that runs is over-sauced.
3. You should taste fish first and heat second. If the order is reversed, the sauce is doing too much work.
4. It should be cold. Spicy tuna sitting at room temperature is a sign of a filling made too far ahead.

The other spicy fillings

The same treatment gets applied to several other things, and they behave differently enough to be worth distinguishing.

• Spicy salmon – softer and more oily than tuna, so the mixture is looser and the fish flavour carries further through the sauce.
• Spicy crab – built on the cooked crab mixture rather than raw fish, which makes it the option to look for if raw is the problem.
• Spicy scallop – the sweetest of the group and the most delicate; the heat sits very much on top of it.

If you like the idea of spicy tuna but not the raw part, spicy crab is the direct equivalent. It is the same seasoning applied to a cooked filling, and it is on most menus that carry the tuna version.

Ordering it

Spicy tuna works in more formats than most fillings, which is part of why it is everywhere. It appears as a simple cut roll, as the base of larger specialty rolls, and as a hand roll, where the softness of the mixture plays against the crisp seaweed.

As a first raw-fish order it is a reasonable place to start, precisely because the sauce softens the introduction. As a way to taste tuna itself it is a poor choice, because the seasoning is designed to sit on top of the flavour.

If you are working out whether raw is what you want at all, our guide to cooked and raw rolls lays out how to read a menu for it, the beginners guide covers how a roll is put together, and the piece on crab mix explains the cooked filling that sits next to it on most menus. The current selection is on the ordering page.

Frequently Asked Questions

Is spicy tuna raw?

Yes. It is raw tuna chopped and mixed with a chilli sauce. The sauce does not cook the fish, and the preparation does not change what it is.

How spicy is spicy tuna?

Mild in most kitchens. The heat is meant to add warmth rather than dominate, because a sauce hot enough to take over would waste the fish underneath it.

What is the sauce made of?

Usually a chilli paste or hot sauce combined with a creamy element such as mayonnaise, often with a little sesame oil and chopped scallion.

Why is spicy tuna softer than plain tuna?

Because it is chopped or minced rather than sliced, and because the creamy element in the sauce binds it. The texture is a result of the preparation, not the fish.

Is spicy tuna a good first order?

It is a reasonable introduction to raw fish, since the seasoning softens it. It is a poor way to taste tuna itself, for exactly the same reason.