Hokkaido, Japan — salmon fishery tradition; name from Russian 'ikra' via Meiji-era trade
Ikura (いくら, individual salmon eggs) and sujiko (筋子, whole salmon egg sac) represent Japan's most beloved domestic roe product — bright orange-red spheres of salmon eggs used on sushi, in donburi, in ochazuke, as a garnish for cold dishes, and occasionally in contemporary pasta. The name 'ikura' derives from the Russian 'ikra' (roe), reflecting the Hokkaido fishing tradition and Japanese-Russian trade. Sujiko is the whole egg sac of salmon removed before the eggs separate; it is marinated in soy sauce and mirin as a cured whole sac and eaten sliced with rice. Ikura preparation involves separating the eggs from the skein, washing, and marinating in soy sauce (or soy+sake+mirin) for a minimum of 6 hours — homemade ikura dramatically outperforms commercial products in freshness, size of eggs, and flavour intensity. Autumn (October–November) in Hokkaido is the peak salmon harvest and ikura season.
Clean, ocean-sweet, fatty salmon oil flavour with a satisfying pop-and-release texture; soy-sake marinade adds savoury depth without masking the natural sweetness; the combination of warm rice and cold ikura is a temperature contrast that enhances both components
Separating ikura from the skein: pour lukewarm salt water over the sac in a bowl, and gently work the eggs free with your hands — the warm water loosens the membrane; remove any membrane fragments; wash in several changes of clean cold water; drain thoroughly; marinate immediately; the soy marinade cures the eggs from raw to 'cured-raw' state within 6–8 hours.
Home ikura production in autumn: purchase fresh skein from a Japanese fishmonger or Hokkaido mail-order; separate in warm salt water, wash, marinate in 3 tablespoons soy + 2 tablespoons sake + 1 tablespoon mirin per 200g eggs for 8–10 hours; the result is far superior to any commercial product; ikura donburi (salmon roe on warm rice in a lacquer bowl) with wasabi is one of Japan's most satisfying simple meals — the warm rice gently heats the eggs and their fat releases into the rice; premium ikura from Hokkaido Masu (pink salmon) or Shirosake (chum salmon) has larger eggs than Pacific salmon.
Using hot water to separate ikura (hot water cooks the eggs, causing them to lose their pop and turn pale — use lukewarm, not hot, water); over-marinating (more than 24 hours creates excessively salty, shrunken eggs — the optimal window is 6–12 hours); washing ikura in tap water with chlorine for extended periods (chlorine damages the delicate egg membrane); serving refrigerator-cold ikura on sushi (room temperature allows the fat-soluble aromas to be perceived).
The Japanese Kitchen — Hiroko Shimbo