Negitoro and Tekka Maki Fatty Tuna Preparations

Negitoro: Tsukiji market waste-reduction innovation, attributed to 1970s sushi counter development; tekka maki: Edo-period gambling house sushi culture; gunkan format invented Kyubey Ginza 1941

Negitoro (ねぎとろ) is one of Japan's most beloved tuna preparations—a mixture of fatty tuna (toro) scraped from the backbone and neck bones of the fish combined with finely chopped negi (spring onion), served as gunkan maki (naval battleship sushi), donburi, or hosomaki rolls. The preparation originated as an economic technique: after skilled Tsukiji filleting, significant amounts of fatty, flavourful tuna remain attached to the vertebrae, collar bones, and other skeletal surfaces, impossible to remove with a knife. The solution was the spoon-scraping technique (suki-tori): a rigid spoon or the back of a yanagiba are dragged along the bone to harvest the thin, intensely fatty meat in ribbons. This scraped toro, when combined with sesame oil (a small amount, as lubricant and flavour amplifier), soy sauce, and chopped negi, becomes negitoro—arguably more flavourful than carved toro pieces because the bone-adjacent meat carries more concentrated fat and umami. Tekka maki (鉄火巻き)—the classic tuna hosomaki—uses red lean tuna (akami) sliced into a rectangular strip and rolled in a thin, tight cylinder with shari (vinegared rice). The name 'tekka' (iron fire, gambling house) reflects the Edo-period gambler's practice of eating these hand-held rolls during mahjong sessions. Both preparations are among the most consumed sushi forms globally and represent different tuna fat level registers: akami's clean leanness versus negitoro's unctuous richness.

Negitoro: intensely fatty, sweet tuna with spring onion sharpness. Tekka maki: clean lean tuna with rice sweetness and nori marine note. Both benefit from wasabi heat as fat-cutting contrast