Japan — Kanto style (Tokyo): Edo period, 1700s; Kansai style (Osaka): parallel development in Osaka merchant culture; Doyo no Ushi no Hi midsummer eel-eating tradition formalised by calendar custom
Kabayaki is the technique of glazing fish or eel with tare (a concentrated sweetened soy sauce) and grilling over charcoal in repeated cycles of basting and heat application, producing a lacquered, glossy, deeply caramelised surface. The word kabayaki originally referred to whole fish (bulrush-shaped, kaba) grilled on skewers; today it is most closely associated with unagi (freshwater eel) preparation, which is the definitive Japanese summer luxury food consumed on Doyo no Ushi no Hi (midsummer eel day, in late July) to ward off summer heat fatigue. The Tokyo (Kanto) and Osaka (Kansai) methods of kabayaki preparation differ significantly: Tokyo steam-before-grilling produces a softer, more yielding texture; Osaka grills directly from raw for a firmer, more charred result.
Lacquered sweetness from caramelised tare, fatty eel richness, subtle smoke from charcoal, bright sansho pepper citrus punctuation, white rice backdrop
Unagi is prepared by splitting along the belly (Kanto) or back (Kansai), removing the spine, and cutting into appropriate lengths for skewering. Kanto method: skewer, grill briefly to firm the surface, then steam (mushi) for 20 minutes to render fat and soften, then return to the grill and apply tare in 3–4 successive rounds of brush-and-grill, each round building up the lacquered glaze. Kansai method: grill directly without steaming. Tare is accumulated over years in restaurant kitchens — each day's dipping adds depth, and some tare pots have been maintained continuously for decades.
Preparing kabayaki at home without the traditional charcoal grill: a very hot oven (250°C) with broiler, combined with a non-stick pan for initial searing, can approximate the result if tare is applied in 3 rounds with high heat between. The tare recipe base: 4 parts soy sauce, 2 parts mirin, 1 part sake, 0.5 parts sugar, reduced to a syrup with a piece of eel head added during the reduction for flavour. Serve unagi kabayaki over rice (unadon) garnished with a sprinkle of sansho pepper — the sansho's citrus-herbal heat is the essential counterpoint to the rich eel.
Insufficient tare applications — the characteristic lacquered depth requires multiple rounds of basting with high heat between each application to caramelise the sugar properly. Grilling too close to the charcoal, causing burning rather than even caramelisation. Using commercial unagi sauce (bottled) as a substitute for traditionally maintained tare — the depth and character are incomparable. Skipping the steaming step in Kanto preparation, producing tough, fatty eel.
Tsuji, Shizuo — Japanese Cooking: A Simple Art; Davidson, Alan — The Oxford Companion to Food