Ikura Don

Hokkaido's coastal fisheries — particularly around Shiretoko and Kushiro — have processed salmon roe since the early 1900s, when Russian and Japanese fishermen exchanged techniques (the separate-grain salting method spread from Russia around the Meiji 40s / 1900s, tied to Kamchatka salmon-fishery development and Russo-Japanese War contact) (the word ikura itself is from Russian икра, meaning roe). The donburi format came later, mid-20th century, as fishing-port lunch counters started serving the roe straight over rice rather than as a sushi topping.

Hokkaido coastal fisheries near Shiretoko and Kushiro have processed salmon roe since the late 1800s — the word ikura is from Russian икра. Shoyu-zuke (soy-mirin-sake cure) is the home-kitchen default; over-curing toughens the membrane and the eggs lose their snap.

A bowl of vinegared sushi rice topped with a translucent mound of orange salmon roe, each egg the size of a pea. The eggs pop between the teeth and release a salty-briny liquid — soy-cured ikura is sweeter, shio-cured is sharper. A dab of wasabi underneath, a sliver of shiso leaf, sometimes a quail yolk. Eat fast; the eggs go cloudy if they sit.

The cure is everything. Skein-fresh roe is washed in warm salt water to release the eggs from the membrane, then steeped in soy-mirin-sake (shoyu-zuke) or just brine (shio-zuke). Over-curing toughens the membrane and the eggs lose their snap; under-curing leaves a fishy edge. The shoyu version is the Hokkaido home-kitchen default — most port towns cure their own fall catch each September.