Japanese Unagi Kabayaki: Eel Preparation and the Regional East-West Split

Unagi kabayaki (grilled eel in sweet soy glaze) is among Japanese cuisine's most technically demanding preparations—and one of the most clearly bifurcated by regional identity. The Kanto–Kansai divide in eel preparation is total: Kanto opens the eel from the back (seppuku—a reference to ritual suicide, the samurai tradition of Edo); Kansai opens from the belly. Kanto preparation: after splitting from the back, the eel is steamed for 20–30 minutes before being grilled with tare—the steaming step removes excess fat and creates a more delicate, less oily result; Kansai skips the steaming and grills directly, producing a richer, slightly crisper, more intensely flavored result. The tare sauce for kabayaki is a perpetual sauce similar to yakitori tare—each shop's tare is maintained for years or decades, with constant replenishment. Unagi is considered peak quality during doyo no ushino hi (midsummer festival day, typically late July), though actually eel quality is higher in autumn when the eel has fattened for winter. The custom of eating eel in summer is partly folkloric—attributed to a 18th-century promotion by eel shop owners. Hitsumabushi (Nagoya-style eel over rice with the three-stage eating ritual) represents a regional variation with its own cultural weight. For professionals, the endangered status of Japanese eel (Anguilla japonica) makes provenance and sourcing increasingly important.