Japan — unagi culture documented from Jomon period; kabayaki technique with tsume sauce formalised in Edo period Tokyo; Kanto-Kansai stylistic split became culturally defined through 18th-19th century restaurant culture
Kabayaki (unagi eel grilled in sweet-savoury sauce) is among Japan's most demanding professional grilling techniques — a preparation applied primarily to freshwater eel (unagi, Anguilla japonica) that requires a precisely sequenced series of grilling, steaming, and re-grilling steps that define the regional identity of Japanese eel cuisine. The central technical and cultural debate in Japanese eel culture is the regional split between Kanto (Tokyo) and Kansai (Osaka-Kyoto) styles — a division that goes far deeper than mere seasoning differences. In Kanto style: the eel is split from the back (seki-biraki, a technique supposedly linked to warrior culture where splitting from the belly was considered seppuku-like and inauspicious); after splitting, the head is removed and the fish is skewered; the raw eel is grilled once over binchotan charcoal; then steamed in a covered bamboo steamer for 20–30 minutes (mushimono stage) to melt the fat and produce a soft, almost quivering interior; then re-grilled and basted repeatedly with the proprietary tsume sauce (a reduction of mirin, sake, and soy sauce that each restaurant develops and maintains for years, adding each day's drippings to the previous batch). In Kansai style: the eel is split from the belly; the head is left on during initial cooking; there is no steaming stage — the eel is grilled directly over charcoal from raw to finished, producing a crispier, more robust exterior and a firmer interior texture that Kansai proponents argue better showcases the eel's natural flavour. Each style has passionate adherents, and the distinction is one of the most fiercely debated topics in Japanese culinary regionalism.
Kanto style: rich, soft, quivering; caramelised tsume sweetness; fatty eel interior melted by steaming; complex accumulated tsume basting depth. Kansai style: crispier, more direct eel flavour; less sweet tsume; firmer texture; more assertive charcoal note
{"Kanto style: back-split, headless, raw grill → steam 20–30 minutes → re-grill with tsume basting — yields soft, quivering interior","Kansai style: belly-split, head-on, no steaming — direct charcoal grill raw to finished — yields crispier exterior, firmer texture","Tsume sauce: each restaurant's accumulated reduction maintained for years, adding daily drippings — living flavour heritage, not batch-made","Skewering precision: metal skewers (kushi) inserted to hold the eel flat during grilling; positioning prevents curling and ensures even heat","Binchotan is the only acceptable charcoal for premium kabayaki — gas produces markedly inferior results lacking the clean radiant heat"}
{"Tsume making at home: combine equal parts mirin and sake, reduce by 50%, add soy sauce, return the eel bones (if available), simmer gently 20 minutes, strain","Unadon vs unaju: unadon (eel over rice in a bowl) and unaju (eel over rice in a lacquer box) differ primarily in presentation and price point — the eel and rice are identical","Mountain wasabi (honwasabi) rather than tube wasabi alongside kabayaki: the honwasabi's delicate heat and freshness cuts through the rich fat without overwhelming","The best Kanto-style eel is served immediately after re-grilling — the window between perfect caramelised exterior and dried-out is minutes","Hitsumabushi (Nagoya style): whole unagi kabayaki served over rice, eaten in four ways (plain, with condiments, with dashi/tea) — a formal exploration of one preparation's versatility"}
{"Skipping the steaming stage in Kanto kabayaki — the mushimono step is what produces the characteristic 'melted' interior that defines Kanto eel","Over-applying tsume before the grill surface is established — early tsume application burns the sugar before the eel surface has caramelised","Using oven-grilling without charcoal — the radiant heat of binchotan is part of kabayaki's flavour development","Buying tsume commercially without understanding it will lack the layered accumulation of professional restaurant tsume","Grilling unagi at too low a heat, producing a pale, greasy surface rather than the caramelised gloss that defines the preparation"}
Japanese Cooking: A Simple Art — Shizuo Tsuji; The Japanese Kitchen — Hiroko Shimbo