Mentaiko, Explained: What It Is and Why It’s on Everything

Mentaiko is on the fries, in the pasta, under the salmon, folded through the mayonnaise and piped onto things that have no business carrying it. It has become one of those words Singapore menus use as a promise of savouriness, and most people order it without ever being told what it is.

It is fish roe. Specifically it is pollock roe that has been salted and then steeped in a seasoned liquid, and everything interesting about it follows from those two steps. We use it in our own kitchen on Hamilton Road, so this is written from the position of somebody who buys the stuff and has to make it earn its place on a plate.

What mentaiko actually is

The roe comes from Alaska pollock — the same fish that ends up as surimi in half the world’s seafood sticks, which is a useful thing to know when you are wondering why the roe of a humble fish costs what it does. The eggs stay in their natural membrane sac, which is why mentaiko arrives as a plump lobe rather than as loose beads, and why the texture is granular and faintly resistant instead of popping like the roes you get on sushi.

Fukuoka’s own tourism material describes karashi mentaiko as “Alaskan Pollock roe that is soaked in a mixture of liquid seasonings including numerous spices such as chili pepper”, and calls it the “Flavor of Hakata”. That is the whole definition, and it is worth noticing how much of it is about the soak rather than the fish.

Tarako, mentaiko, karashi mentaiko: the words, sorted

Tarako is the salted roe on its own — cured, savoury, no chilli. Pale pink, gentler, the version that gets grilled whole and eaten with rice.

Mentaiko is the same roe taken through a seasoned marinade. In Japan the word covers both mild and spicy versions.

Karashi mentaiko is the chilli-marinated one — karashi meaning hot — and it is the version that made Fukuoka famous. When a Singapore menu says mentaiko, this is almost always what has arrived.

Two things fall out of this that matter when you are ordering. First, the difference between tarako and mentaiko is a marinade, not a species, so anyone telling you mentaiko is a different fish is guessing. Second, because the flavour lives in the soak, mentaiko varies enormously between makers in a way that tarako does not. Two tubs can taste like different ingredients.

How it is made, and why that dictates how you should treat it

The sequence is salt first, then steep. Salting draws water out of the sacs and firms the eggs. The marinade that follows is where each producer’s house style lives — chilli in some proportion, and typically rice-based seasonings and a savoury liquid alongside it — and the roe then sits for days while the flavour works its way in through the membrane. Makers guard their ratios, and the variation between them is real rather than marketing.

The practical consequence is that mentaiko is a cured product and not a cooked one. Heat it hard and the eggs seize, the texture goes chalky and the aroma you paid for burns off. This is the single most common way a mentaiko dish is ruined in a restaurant: it gets blowtorched to a colour rather than warmed to a temperature. If you are cooking with it at home, stir it into something warm off the heat rather than into something hot on it.

Hakata, and a date that does not quite line up

The received history runs like this: the roe was eaten first on the Korean peninsula as myeongran-jeot, salted pollock roe fermented with chilli and garlic; a man who had grown up there brought the idea to the Hakata ward of Fukuoka after the war and rebuilt it for Japanese palates; and the shop he founded, Fukuya, became the origin point of karashi mentaiko as Japan now knows it.

We went to Fukuya’s own company pages to check it rather than repeating the version that circulates. Their site gives the founder as Kawahara Toshio and the founding year as 1948, in Hakata Nakasu, under a company line that translates as “we are glad we made mentaiko” and a stated philosophy of “good things, cheaply and safely”.

Most retellings date the first karashi mentaiko to 1949. Fukuya’s own page dates the company to 1948. We are not going to smooth that over: a shop opening and a product arriving are two different events and there is no contradiction in them being a year apart, but the tidy single date you will see quoted everywhere is tidier than the source it comes from. Take the origin as Hakata, post-war, Kawahara — and hold the year loosely.

Why it ends up on absolutely everything

There is no mystery here once you look at what mentaiko is chemically. It is salt, it is rich in the compounds that read to us as savoury depth, and it carries all of that in a soft, fatty, spreadable form. That combination is unusual. Most intensely savoury ingredients are dry — dried fish, dried mushroom, a hard cheese — and need rehydrating or grating before they can be distributed through a dish. Mentaiko already behaves like a sauce.

So it does three jobs at once: it seasons, it enriches, and it binds. Put it in mayonnaise and it seasons the mayonnaise. Put it through hot pasta and the residual heat loosens it into an emulsion. Put it on a fried thing and the salt and fat do what salt and fat do. Singapore kitchens did not adopt it because of a trend; they adopted it because it is a shortcut to depth that also happens to spread.

The failure mode is equally predictable. Because it seasons so effectively, it invites laziness — a dish where the mentaiko is doing all the work and there is nothing underneath it. If it tastes of salt and nothing else, that is what has happened.

How we use it, at both our places

We build ours into a mentaiko XO, which puts the roe into a chilli-and-savoury paste rather than using it neat. At 29 Hamilton Road it goes into the Cassava and Taramasalata: our menu’s own line reads twice-cooked cassava chippies, housemade labne, mentaiko XO, tobiko. At Li’l Habibi on Haji Lane it anchors a dish that is actually named for it, the Mentaiko Taramasalata at $13, with housemade labne, tobiko, crispy shallots and chives.

The reason we go through XO rather than serving mentaiko plain is that our kitchen sits between two cuisines, and taramasalata — the Greek and Levantine cured-roe dip — is already a roe dish. Two roe traditions were always going to meet on our menu; the question was only which one carried the chilli. We have written that meeting up properly in the piece on the dish itself, so this guide stops at the ingredient.

Worth saying plainly: mentaiko is not the only roe on our list. Ikura sits on both the chickpea hummus with macadamia tahini and the Atlantic seabass, and tobiko turns up in both taramasalatas. Those are three different roes doing three different jobs, and they deserve their own post rather than a paragraph here.

Buying it, keeping it, eating it

Buy it whole in the sac rather than as a pre-mixed sauce if you can — the sauces are usually mostly mayonnaise. Look for lobes that are intact and glossy rather than weeping. Keep it cold and eat it quickly; it is a cured product with a short life once opened, not a preserve.

To use it, slit the membrane and scrape the eggs out with the back of a knife. The membrane itself is edible when the lobe is grilled whole but unpleasant stirred through anything.

The dietary question, answered straight

Mentaiko marinades commonly contain alcohol-based seasonings, so it is not suitable for anyone avoiding those, and the roe is cured rather than cooked. We are not a halal restaurant and never present ourselves as one — we serve pork and a full bar at both venues — and we set out the whole picture in our FAQ rather than burying it. Tell us about allergies and restrictions when you book; our menu asks for exactly that.

Where to taste it

The honest recommendation is to eat it as part of a mezze spread rather than on its own, because the point of a roe paste is what it does to everything around it. Our menu shows where it sits, the gallery shows the room, and our ordering guide walks a first-time table through the whole list. If you want the broader map of Japanese ingredients and dining in this city, the full guide is here, and the matcha piece covers the other Japanese ingredient we lean on hardest.

Then book a table and start with the cassava.