Japanese · Tsukiji, Tokyo

Negitoro and Tekka Maki Fatty Tuna Preparations

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.

ServesAbout 8 pieces gunkan maki (negitoro) and 8 pieces tekka maki — four portions combined

Sourced2of 10 in BC

Cook

The Market List

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For the negitoro

300 g

tuna carcass (backbone, collar bones, skeletal surfaces)

bone-adjacent fatty meat to be scraped; do not discard after filleting

Not yet stocked in British Columbia

20 g

negi (spring onion)

finely and uniformly minced

Not yet stocked in British Columbia

5 ml

sesame oil

use sparingly; a few drops too many creates a greasy result

Your own market

5 ml

soy sauce

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5 g

fresh ginger

finely grated

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For the tekka maki

150 g

akami (lean red tuna loin)

sliced against the grain of the muscle fibre into rectangular strips

Not yet stocked in British Columbia

For the shari (vinegared rice)

400 g

cooked Japanese short-grain rice

seasoned with sushi vinegar; kept at body temperature — not refrigerated

Not yet stocked in British Columbia

60 ml

sushi vinegar (su)

rice vinegar, salt and sugar combined at standard sushi proportions

Not yet stocked in British Columbia

Assembly

sheets nori

peak freshness; use immediately — moisture degrades crispness within 5 minutes

Not yet stocked in British Columbia

20 g

wasabi

freshly grated or prepared paste

Not yet stocked in British Columbia

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The Method

Scrape the tuna carcass using the suki-tori technique: drag a rigid spoon or the back of a yanagiba firmly along all bone surfaces — backbone, collar bones, and any skeletal surfaces — harvesting the fatty meat in thin ribbons. The yield is complete when no white or pink film of fat-streaked flesh remains visible on the bone.

Combine the scraped toro with the finely minced negi, soy sauce, sesame oil, and grated ginger. Work the mixture with a knife or spoon until the negi is evenly distributed throughout the tuna; no sporadic green clusters should remain. Taste: the negi sharpness should be present in every part of the mixture, the sesame oil perceptible but not dominant. This step decides the dish — too much sesame oil obscures the natural tuna fat; too little integration of the negi produces pungent, uneven bites.

Prepare the shari at body temperature. Season the cooked rice with sushi vinegar and fold — do not stir — until the grains are evenly coated and glossy. For the gunkan portions, the shari must be calibrated slightly firmer than standard: loose shari will collapse under the weight of the wet negitoro topping. The rice is ready when each grain holds its shape under light pressure but adheres to its neighbour.

For the gunkan maki: form 8 compact oblongs of shari, each approximately 18 g. Cut nori into strips of sufficient width to encircle each shari oblong with a 1 cm band projecting above the rice. Wrap the nori band as tightly as possible around each shari finger; press the seam closed with a grain of rice as adhesive. The nori should stand upright and firm — a loose wrap will unravel at the table.

Spoon the negitoro mixture into the nori cup of each gunkan until level with the top of the nori band. Apply a small amount of wasabi to the shari beneath the negitoro before topping. Serve within 5 minutes; the nori must still be audibly crisp when bitten.

For the tekka maki: lay a half-sheet of nori, rough side up, on a bamboo mat. Spread a thin, even layer of shari — approximately 100 g — leaving a 2 cm border at the far edge. Place one akami strip, cut against the grain, along the near third of the rice. Apply wasabi directly to the akami strip. Roll the mat forward in a single, firm motion to form a tight cylinder; the roll is complete when the far border of nori seals flush against the outside of the cylinder and the cross-section shows a centred core of fish with an even margin of rice.

Slice each tekka maki roll into 8 even rounds with a wet, sharp knife using a single drawing stroke per cut — sawing compresses the roll. Cut to order or within 3 minutes of rolling; nori softens rapidly from the moisture of the shari.

III

Quality Hierarchy

Reserve — Scraped toro from hon-maguro (Pacific bluefin) carcass after Tsukiji-standard filleting; negi harvested same morning; freshly grated wasabi root; nori from a sealed, day-of-opening pack.

Estate — Scraped toro from bigeye or Southern bluefin carcass; negi trimmed and minced to order; good-quality prepared wasabi paste; premium nori opened to order.

Market — Commercially available negitoro mix from reputable fishmonger, verified free of excessive oil additives; akami from yellowfin; standard wasabi paste; fresh nori from a well-stored pack.

House — Any fatty tuna trim scraped and combined with negi; soy and sesame oil balanced to taste; tube wasabi; nori used promptly from a re-sealable bag.

Sensory Tests

◇Sight. No white or pink fat-streaked film remains on any bone surface after scraping — the bone appears clean and pale.

◇Sight. The negitoro mixture is uniform in colour and texture; no discrete clusters of negi are visible.

◇Touch. Shari for gunkan holds its oblong shape under light pressure without crumbling, yet the grains adhere to one another.

◇Sight. The nori band of the gunkan stands upright, tight, and without a visible seam gap; the topping sits level with the nori rim.

◇Sound. Nori gives a clean, audible snap when bitten — any leathery resistance indicates it has absorbed moisture and service has been delayed too long.

◇Sight. Tekka maki cross-section shows an even, centred core of akami with a uniform margin of white shari and an unbroken nori exterior.

◇Where it lives or dies. The negitoro mixture must be worked to uniform distribution of negi throughout the tuna, with sesame oil present but restrained — a few drops too many suppress the tuna's own fat character and produce a greasy, heavy result from which the dish cannot recover.

V · Cross-Cuisine Parallels

Italian nduja: both negitoro and nduja exploit fat-rich portions of animals that would otherwise be wasted — scraped tuna backbone fat versus spreadable fermented pork fat; both achieve intensity through mechanical processing (Tsuji, The Thread). French rillettes: rillettes are made by scraping braised pork from bones and processing to a spreadable paste — the same economic origin as negitoro, using all bone-adjacent meat (Tsuji, The Thread). Spanish ventresca (almadraba bluefin belly): Spanish ventresca and Japanese toro both represent the most prized fatty portions of the same species, prepared within different but equally prestigious traditions (Tsuji, The Thread).

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What to Pour

The pairing

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Kiku-Masamune Sake Brewing · Nada

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Sake

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The whole pairing

VII · Origin & Lineage

Negitoro originated as a waste-reduction innovation at Tsukiji market, attributed to sushi counter development in the 1970s; the gunkan format itself was invented at Kyubey Ginza in 1941. Tekka maki descends from Edo-period gambling-house sushi culture, where hand-held hosomaki rolls were eaten between mahjong sessions without interrupting play — the name tekka (iron fire) is a direct reference to that gambling context. Sources: Tsuji Shizuo, Japanese Cooking: A Simple Art; Jiro Ono (Sukiyabashi Jiro) technique documentation; Sushi Sho apprenticeship records.

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Sourced through Provenance

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