Rice dishes ── Sushi toppings
Shirako
fish milt, a soft, custard-like organ served raw or lightly seared
Fish milt eaten as food — taken from cod, pufferfish, anglerfish, and others — prized for a soft, custard-like texture unlike anything else on the counter. In sushi, it's most often served as gunkan-maki, and only during the winter months.
Lineage
What it's made of
This is fish milt — the male reproductive organ — soft, moist, and custard-like in texture. It's taken from several species including cod, pufferfish, anglerfish, salmon, sea bream, and Spanish mackerel; cod milt in particular is sometimes paired on menus with 'mako,' the cod's own roe. Cod milt is said to carry a distinctive shape, folded like a ruffled membrane, and its season is said to fall in winter.
How it's made
Because the organ falls apart easily, it's firmed in ice water or similar before use to hold its shape. As it still can't be pressed into nigiri, it's most often mounded instead into gunkan-maki, rice banded by nori. Beyond serving it raw, it's sometimes lightly seared, dressed in vinegar, or added to soup or a hot pot. Salting or a quick blanch to clear any off-smell is said to be the core of the prep work.
Why it took this shape
Given what an organ like this is, it can't hold together well enough to be pressed into a cut of nigiri. Much like salmon roe and sea urchin, it's thought to have become usable as a sushi topping only once gunkan-maki — the style of holding loose material with a wall of nori — was devised. With most source fish at their peak in winter, it's treated as a cold-season delicacy alongside hot pot dishes.
Before you go
- How to use a convenience storeA quick guide to choosing rice balls and hot snacks, buying coffee, paying by cash, IC card, or tap payment, using the eat-in corner, and sorting your trash — the basics for a first visit.
- Station food and ekiben (station bento)Where and when to find ekiben (station bento) before it sells out, etiquette for eating on board, how standing soba and udon stalls work, and where to find souvenirs sold inside the station.
- Soraben and airport diningA guide to what soraben means and how it differs from ekiben, whether to buy before or after security, etiquette for eating on board, airport restaurants, and things to check before buying food souvenirs to take home.
Dishes in the same style
- AkagaiA clam named for its red flesh, colored by blood that carries an iron-based pigment rather than the copper most mollusks use. Prized for its crisp bite, it's a premium topping often substituted commercially with the smaller ark shell relative sarubō-gai, and freshness shapes the work more than almost anything else.
- Akami no ZukeLean tuna cured in a soy-based marinade. Born as a way to keep the fish from spoiling before refrigeration existed, it's said to survive today as its own deliberate preparation even now that fattier cuts get the attention — one of the founding techniques of Edomae sushi itself.