Japanese · Japan

Unaju Unagi Kabayaki Rice Box Lacquer Eel Grilled

Unaju is the formal serving format for grilled freshwater eel (unagi kabayaki) presented in a lacquered wooden box (ju-bako) over rice—one of Japan's most celebrated and expensive traditional dishes, consumed particularly on Doyo no Ushi no Hi (Midsummer Day of the Ox) in late July as a stamina food. The eel (Anguilla japonica) is filleted by cutting along the spine from the back (Kanto style: sato-age cooking), or from the belly (Kansai style: kabayaki with different finish), skewered, grilled over charcoal, steamed (Kanto) or not steamed (Kansai), then basted with a sweet soy and mirin tare sauce and grilled again until glossy and caramelized. The tare is the restaurant's identity—maintained and replenished over years or decades, developing complex character from accumulated eel fat and caramelization. The Kanto process includes an intermediate steam step which produces very tender, melting texture; Kansai skips the steam for a firmer, crispier result. The endangered status of Japanese eel due to overfishing has made unaju dramatically more expensive—a single serving at a quality unaju restaurant can exceed ¥5,000-10,000. Alternative farmed European and American eels are used but considered inferior. Eel grilling (shirayaki, plain salt-grilled without tare) is a secondary approach showing the eel's natural flavor.

ServesFour portions

Sourced1of 7 in BC

Cook

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whole freshwater eel (unagi, Anguilla japonica)

filleted, skin on, spine removed; or 4 pre-grilled unagi fillets from a Japanese grocery

Not yet stocked in British Columbia

For the kabayaki tare

100 ml

soy sauce

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100 ml

mirin

Not yet stocked in British Columbia

50 ml

sake

Not yet stocked in British Columbia

30 g

caster sugar

approximately 2 tbsp

Your own market

To serve

800 g

short-grain Japanese rice

cooked, kept hot

Not yet stocked in British Columbia

2 tsp

sansho (Japanese mountain pepper)

ground; served at table

Not yet stocked in British Columbia

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The Method

Prepare the kabayaki tare. Combine soy sauce, mirin, sake and sugar in a small saucepan. Bring to a simmer over medium heat, stirring until the sugar dissolves, then reduce by one-third. Remove from the heat and allow to rest; a maintained tare develops character over time and should not be used immediately if it can be avoided. The tare is ready when it coats a spoon lightly and carries a deep caramel-soy aroma.

Prepare the eel according to the Kanto method: fillet by splitting from the back along the spine. Skewer the fillets lengthwise on flat metal skewers to prevent curling over the fire. Place skin-side down over a binchotan charcoal fire at steady high heat. Grill until the flesh turns opaque and white, with the skin beginning to colour — this is the shirayaki stage.

(Kanto method.) Transfer the skewered fillets to a steamer. Steam for 10 to 15 minutes until the flesh is fully tender and yielding to the touch — it should offer almost no resistance when pressed gently. This step is the distinction of the Kanto tradition and produces the characteristic melting texture. Kansai preparation omits this step entirely for a firmer, crispier result.

Return the fillets to the binchotan grill. This is where the dish lives or dies. Brush the flesh side generously with tare, grill for 30 seconds until it begins to caramelize and the edges darken slightly, then brush again. Repeat this baste-and-grill cycle a minimum of three to four times, turning once to glaze the skin side as well. Each application builds the lacquered glaze that is the defining quality of kabayaki. Gas heat, a single basting, or insufficient charcoal heat will not produce this result. The eel is ready when the surface is deeply glossy, mahogany-brown, and fragrant with sweet-smoky caramelization — the interior must remain moist.

Divide the hot cooked rice among four lacquered wooden boxes (ju-bako) or, in their absence, deep lidded bowls. Lay the glazed eel fillets over the rice. Brush with one final application of tare. Serve immediately with ground sansho at the table.

III

Quality Hierarchy

Reserve — Wild-caught Japanese eel (Anguilla japonica) from a specialist supplier; tare maintained and replenished over months or years, accumulating eel fat and Maillard depth; grilled exclusively over binchotan charcoal from Wakayama.

Estate — Farmed Anguilla japonica from a Japanese or Taiwanese aquaculture source; fresh tare reduced and rested for at least 24 hours before use; binchotan charcoal.

Market — Pre-grilled unagi fillets from a Japanese grocery, re-glazed under a high broiler with freshly made tare — a legitimate shortcut; any hardwood lump charcoal.

House — Farmed European or American eel (considered inferior to Anguilla japonica); fresh tare used without resting; domestic oven broiler at maximum heat.

Sensory Tests

◇Smell. The tare carries a deep, rounded caramel-soy fragrance with no raw alcohol edge — the sake and mirin have fully cooked through.

◇Touch. After steaming (Kanto), the flesh yields to gentle pressure with almost no resistance — the interior is tender throughout before the final glaze is built.

◇Sight. After the final baste-and-grill cycle, the surface is deeply glossy and mahogany-brown, with faint caramelized edges — not pale, not blackened.

◇Smell. Over the grill, each tare application produces a sweet, smoky, slightly charred fragrance as the sugars caramelize — the absence of this cue indicates insufficient heat or too thin a baste.

◇Where it lives or dies. The dish lives or dies in the repeated baste-and-grill cycle over binchotan charcoal: each of the minimum three to four tare applications must caramelize fully before the next is applied, building the lacquered glaze that defines kabayaki — a single basting or the substitution of gas for charcoal forfeits both glaze and smoke character entirely.

V · Cross-Cuisine Parallels

French: Lamproie à la Bordelaise — freshwater eel prepared as a formal luxury dish with a complex, long-developed sauce; different technique but the same cultural elevation of eel as a prestige ingredient (The Thread, Shizuo Tsuji — Japanese Cooking: A Simple Art). Chinese: Shanghainese red-cooked braised eel — freshwater eel finished with a sweet soy reduction and repeated basting cycles to achieve a caramelized exterior, closely parallel in glaze-building logic to kabayaki (The Thread, Shizuo Tsuji — Japanese Cooking: A Simple Art).

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What to Pour

The pairing

Nikka From The Barrel

Nikka Whisky — Miyagikyo Distillery · Miyagikyo — Nikka Distillery

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Whisky

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The whole pairing

VII · Origin & Lineage

Japan. Two parallel traditions: Kanto (Tokyo region), in which the eel is split from the back, steamed, then grilled with tare for a melting, tender result; and Kansai (Osaka–Kyoto region), in which the belly-split fillet is grilled without steaming for a firmer, crispier finish. The dish is culturally anchored to Doyo no Ushi no Hi, the Midsummer Day of the Ox in late July, consumed as a stamina food. The binchotan charcoal tradition is associated with Wakayama prefecture. The tare is the living identity of the individual restaurant, maintained and replenished over years or decades. Source: Shizuo Tsuji — Japanese Cooking: A Simple Art.

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