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.
The steaming step (Kanto style) must be precisely timed — under-steaming leaves fat unrendered; over-steaming creates a mushy texture. The tare application is layered — multiple brushings during the final grilling stage build up the sticky, lacquered glaze. Charcoal temperature for final grilling must be high enough to caramelise the tare without burning it. Serving on a hot lacquer box (jubako) or rice bowl keeps the eel at optimal temperature.
For home unagi kabayaki: purchase pre-prepared kabayaki from a quality supplier (preparing raw eel at home is very difficult for the untrained); reheat gently in a covered pan with a small amount of sake and water added, then brush with tare and finish under a hot broiler or with a kitchen torch for the characteristic lacquered surface. For the donburi (unadon): use freshly cooked short-grain rice; the rice should be loose and hot, the eel placed on top with generous tare drizzled over and sansho pepper (kinome) sprinkled to provide aromatic contrast to the richness.
Skipping the steaming step and attempting to achieve Kanto texture by extended grilling — the two cooking methods produce fundamentally different results. Under-reducing the tare — it must be thick enough to adhere and caramelise, not thin enough to run off. Grilling eel that has been previously frozen without proper defrosting — the texture deteriorates significantly.
The Japanese Culinary Academy's Complete Japanese Cuisine Series