Tosa-Zukuri — Kōchi's Bonito Tataki Tradition (土佐造り)

Ingredients

• 1 whole Katsuo (skipjack bonito), filleted into loins at least 4–5 cm thick
• 1 large bundle Dried rice straw (wara), fully dried; bundled for ignition
• For the garnish and condiment
• 1 head Garlic, thinly sliced raw; Kōchi tradition uses a generous quantity
• 4 Myōga (Japanese ginger buds), thinly sliced
• 8 leaves Shiso (perilla), whole or chiffonade
• 120 ml Ponzu, citrus-soy; served on the side
• For the ice bath
• 2 kg Ice, sufficient to fill a large bowl

Method

1. 1
   Fill a large bowl with ice and cold water. Set it immediately beside the fire station so the transfer from flame to bath takes no more than a moment.
2. 2
   Ignite a large bundle of dried rice straw (wara) outdoors or over a suitable fireproof surface. Allow the blaze to reach full violence. The fire burns briefly, intensely, and produces characteristic straw smoke — the temperature reaches 800 °C or above. No other fuel is a substitute: this is where the dish lives or dies.
3. 3
   Hold each flat surface of the katsuo loin directly in the blaze for 5–8 seconds per surface. The exterior chars to a depth of 2–3 mm. The cue is a visibly blackened, tightened crust with the aroma of straw smoke; the interior must remain completely raw.
4. 4
   Plunge the seared loin immediately into the ice bath. Hold it submerged until the surface is cold to the touch and the interior remains ruby-raw. Remove and pat dry.
5. 5
   Slice the loin thickly at 8–10 mm. Each slice must show a visible, distinct band of charred exterior surrounding a cold raw centre. Slices thinner than this lose the defining visual and textural contrast.
6. 6
   Arrange the slices on a serving plate. Lay sliced raw garlic generously across the fish — this is Kōchi's tradition and the quantity should not be reduced. Add sliced myōga and shiso. Serve ponzu alongside. The finished plate presents simultaneously charred and raw, smoked and fresh.