Unagi Kabayaki — Eel Preparation and the Tokyo-Nagoya Divide

Edo (Tokyo), Japan — kabayaki style documented from early Edo period (17th century); Kanto-Kansai style divide established by the same era

Unagi (Japanese freshwater eel, Anguilla japonica) prepared as kabayaki (grilled with sweet soy glaze) represents one of Japan's most technically demanding and culturally significant culinary preparations — a dish with over 400 years of documented preparation tradition and a regional style divide that reflects deeper cultural differences between eastern (Kanto) and western (Kansai/Nagoya) Japan. The Kanto (Tokyo) style involves splitting the eel from the back, removing the spine, cutting into portions, skewering, grilling over charcoal briefly, then steaming in a covered vessel for 15–20 minutes (which renders the subcutaneous fat and produces the characteristically tender, falling-apart texture of Edo-style unagi), then a final glaze-and-grill pass with tare. The Kansai style (Kyoto, Osaka, Nagoya) splits from the belly, skips the steaming step, and grills exclusively — producing a firmer, more charred result with more pronounced bitterness from the caramelised tare. The steaming step in Kanto style is the defining technical intervention: it renders fat while preserving moisture, creating a texture impossible to achieve by grilling alone. The tare for unagi is a living sauce — classic unagi shops maintain tare pots continuously, adding fresh sauce while cooking eel baste the sauce with their fat, developing complexity over decades. Wild eel (tennen unagi) is now extremely scarce and extremely expensive; virtually all commercial unagi is farmed, primarily in Hamamatsu (Shizuoka) and Kagoshima.

Unagi kabayaki is a profound combination of richness, sweetness, and smoke — the eel's fat provides extraordinary mouthfeel, the sweet-soy tare adds caramelised depth and lacquered sweetness, and the charcoal adds a clean smoke that prevents the richness from becoming overwhelming.