Japanese Grilling Over Rice Straw Katsuo No Tataki and Karataki Searing Methods

Katsuo no tataki—seared bonito—is the paradigmatic dish of Kochi Prefecture (Tosa) on Japan's Pacific-facing Shikoku coast, and its production method represents one of Japanese cuisine's most distinctive and dramatic searing techniques. In its traditional form, a whole skipjack tuna fillet (katsuo) is impaled on long metal skewers and held over burning rice straw (inawara) set aflame in a trough, rotating until the surface is charred and fragrant while the interior remains almost entirely raw. The rice straw is critical—it burns at an extremely high temperature but very briefly, imparting a specific smokiness (known as the 'smell of the sea' in Kochi) that no other fuel replicates. The charred surface is plunged immediately into ice water to halt cooking, patted dry, and then sliced thickly and served with tosa-joyu (Kochi's soy sauce, stronger and darker than standard), with an abundance of garlic, ginger, myoga, green onion, and daikon—a multiplicity of condiments that typifies Tosa's bold, masculine food tradition. The 'tataki' method (from 'to strike') refers both to the firm pounding that creates a scored surface for searing and the slapping/pressing of the condiments into the fish before eating. A modern restaurant variation uses blow torches or gas burners against bonito skin for karataki (dry-fire searing) where only the skin surface is charred while the flesh remains raw beneath—a different texture-temperature profile from the full rice-straw technique.