Japanese · Tokyo, Osaka

Japanese Eel Unaju and Kabayaki Technique

Unaju (鰻重, eel over rice in a lacquered box) is one of Japan's most celebrated summer foods, traditionally eaten on Doyo no Ushi no Hi (the midsummer Day of the Ox, usually late July) to combat summer fatigue — the rich protein, fat, and vitamin A content of eel was believed to fortify the body against the heat. The eel preparation follows a strict regional divide: in Tokyo (Kanto), the eel is split down the back, skewered, and steamed before grilling (mushiyaki) — producing an extraordinarily soft, yielding texture; in Osaka (Kansai), the eel is split down the belly, skewered, and grilled directly without steaming — producing a crispier skin and more pronounced charcoal flavour. Kabayaki (蒲焼) is the glazing technique applied to the grilled eel: a tare (secret sauce) of mirin, sake, soy sauce, and sugar is applied repeatedly during multiple rounds of grilling, building up layers of caramelised, glossy coating. The unaju tare, passed down through generations within eel restaurants (unagi-ya) without adding new stock — only replenishing — is considered part of the restaurant's identity. The grilling sequence for Kanto: grill over charcoal, steam 10–15 minutes, glaze with tare, grill again for 2–3 minutes, glaze, grill again — three to four glaze cycles produce the lacquered surface. Doyo no Ushi no Hi demand makes July–August the peak eel consumption season though cultivated eel is available year-round.

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ServesFour portions

Sourced1of 10 in BC

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The Market List

The benchmark for each ingredient, and who stocks it near you. Tap a stockist to go straight to the product.

whole freshwater eel (unagi)

split down the back (Kanto style), skin on

Not yet stocked in British Columbia

For the tare

120 ml

mirin

Not yet stocked in British Columbia

120 ml

sake

Not yet stocked in British Columbia

120 ml

soy sauce

Purely Artisan Foods · San Diego →

1 tbsp

sugar

Your own market

For the unaju

700 g

Japanese short-grain rice

cooked and extremely hot

Not yet stocked in British Columbia

Accompaniment

eel liver (unagi no kimo)

grilled

Not yet stocked in British Columbia

500 ml

dashi

light, clear

Not yet stocked in British Columbia

mitsuba sprigs

Not yet stocked in British Columbia

yuzu zest rings

cut thin

Not yet stocked in British Columbia

Each tap is counted, so the stockist sees the demand Provenance sends them.

The Method

Prepare the tare. Combine mirin, sake, soy sauce, and sugar in a heavy saucepan. Bring to a gentle simmer over low heat, stirring until the sugar dissolves. Reduce slowly until the liquid coats the back of a spoon and carries a deep, glossy caramel colour. Do not discard this foundation — replenish with the same proportions of mirin, sake, and soy as the pot depletes over successive uses. The tare is done when a spoon drawn through it leaves a slow-closing line.

Skewer the eel. Thread metal or bamboo skewers through each eel fillet at even intervals to hold the flesh flat and prevent curling. The flesh must lie in full contact with the grill grate; any arch will produce uneven heat and compromise the glaze cycle.

Grill the eel over charcoal — Kanto (Tokyo) technique. Place skewered eel skin-side down over a hot charcoal bed. Grill until the flesh firms to the touch and the skin shows the first pale colour — it is not yet ready for the steamer until the flesh has lost its raw translucency.

Steam the eel. Transfer the grilled eel to a steamer. Steam for 10–15 minutes. This is the Kanto-defining step, and this is where the dish lives or dies: the steam denatures the collagen throughout the flesh, producing the characteristically soft, yielding texture that separates Kanto-style unaju from all other preparations. Understeaming leaves the flesh resistant; oversteaming begins to collapse its structure. The eel is ready when it yields completely to the slightest pressure of a finger but holds its form.

First glaze and return grill. Remove the eel from the steamer and brush generously with tare on all surfaces. Return to the charcoal grill. Grill for 2–3 minutes. The tare must catch and begin to caramelise — the correct cue is a smell of darkening soy and sugar with faint char, not burnt bitterness.

Second and third glaze cycles. Brush again with tare and return to the grill. Repeat this sequence three to four times in total. Each application burns slightly before the next is laid over it. The dish is ready when the surface presents a deep, lacquered, mirror-like gloss and the eel crackles faintly under the brush.

Compose the unaju. Pack freshly cooked, extremely hot rice into lacquered boxes. Lay the glazed eel immediately over the rice. The eel warms from the rice below and the environment above; cold rice produces cold eel at table — the temperature of the rice is structural, not incidental. The assembled box is ready when rising steam is visible at the rim.

Prepare the kimo-sui. Warm the clear dashi to a gentle simmer. Add the grilled eel livers. Ladle into small bowls. Lay mitsuba sprigs and a thin ring of yuzu zest over each. The soup is ready when the yuzu releases its scent at the moment of service.

III

Quality Hierarchy

Reserve — Wild-caught Japanese freshwater eel (Anguilla japonica) at peak summer condition; tare of documented multi-generational provenance from an unagi-ya; premium hon-mirin (genuine mirin, not mirin-style seasoning); charcoal from binchotan for an even, odourless heat.

Estate — High-quality cultivated Japanese eel from a reputable domestic producer; home tare reduced from first-quality mirin, sake, and soy and maintained across multiple cooking sessions rather than made fresh each time; hardwood charcoal.

Market — Cultivated eel, fresh or vacuum-packed and pre-split; commercial hon-mirin; home tare made fresh per session and reduced slowly; gas grill managed carefully for even heat.

House — Pre-cooked vacuum-packed kabayaki eel reheated in a covered pan over very low heat or in a steamer — never a microwave; store-bought tare supplemented with a reduction of mirin, soy, and sugar to add depth before use.

Sensory Tests

◇Touch. After steaming, the eel yields completely to the lightest finger pressure yet holds its form without collapse — collagen is fully converted.

◇Sight. After the final glaze cycle, the surface carries a deep, unbroken lacquer with a mirror sheen; no dull or dry patches remain.

◇Sound. The glazed eel crackles faintly under the brush during the final glaze application — the caramelised crust is set.

◇Smell. During each glaze-and-grill cycle, the tare smells of darkening soy and caramel with a controlled edge of char — any acrid note signals the glaze is burning through rather than caramelising.

◇Sight. Steam rises visibly from the lacquered box at the moment of service — the rice beneath the eel is sufficiently hot to carry warmth upward through the fish.

◇Where it lives or dies. The Kanto steam of 10–15 minutes must fully denature the collagen throughout the flesh — without it, no number of glaze cycles will produce the silky, yielding texture that defines the dish.

V · Cross-Cuisine Parallels

Peking duck (Chinese): repeated glaze applications during roasting build a caramelised, lacquered exterior through the same coat-and-cook cycle that defines kabayaki. Barbecue basting technique on low-and-slow smoked meats (American Southern): progressive sauce or tare application at multiple cooking stages builds flavour layers through Maillard reaction and sugar caramelisation — the structural logic is shared with kabayaki.

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What to Pour

The pairing

Nikka From The Barrel

Nikka Whisky — Miyagikyo Distillery · Miyagikyo — Nikka Distillery

Not yet stocked in British Columbia

Whisky

From British Columbia

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Without alcohol

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The whole pairing

VII · Origin & Lineage

Japan, Edo period. Two distinct traditions evolved in parallel: the Tokyo (Kanto) school, splitting the eel down the back and steaming before grilling (mushiyaki) to produce a silk-textured flesh; and the Osaka (Kansai) school, splitting down the belly and grilling directly for a crispier skin and pronounced charcoal character. Kabayaki — the repeated tare-glaze technique — is common to both. The tare itself is treated as a living institution within unagi-ya: the pot is never emptied, only replenished, and the oldest houses document provenance of over one hundred years. The dish is inseparable from Doyo no Ushi no Hi, the midsummer Day of the Ox, when eel's richness in protein, fat, and vitamin A was held to fortify the body against summer fatigue. Source: Tsuji, S. — Japanese Cooking: A Simple Art; Japanese eel industry documentation.

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Sourced through Provenance

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Purely Artisan Foods

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