Katsuo No Tataki — Direct Flame Searing Technique

Ingredients

• 600 g katsuo (skipjack tuna) fillet, sashimi-quality, absolutely fresh; not frozen or thawed
• For the ponzu
• 60 ml fresh yuzu juice or lime juice
• 30 ml rice vinegar
• 60 ml soy sauce
• To finish
• 4 g raw garlic, sliced paper-thin
• 10 g fresh ginger, finely grated
• 20 g myoga (Japanese ginger bud), finely sliced
• 20 g green onion, finely sliced
• 5 g katsuobushi (dried bonito flakes)

Method

1. 1
   Combine the yuzu or lime juice, rice vinegar, and soy sauce in the ratio 1 : 0.5 : 1. Stir, cover, and rest at least 24 hours before use. The ponzu is ready when the yuzu fragrance and the soy have knit into a single, balanced liquid.
2. 2
   Prepare a large bowl of heavily iced water and set it within arm's reach of the heat source. The ice bath must be ready before the flame is lit — there is no time to assemble it after charring.
3. 3
   This is where the dish lives or dies. Hold the katsuo fillet on a skewer or in tongs directly over the open flame of a propane blowtorch — applied very close to the surface and rotated constantly — or press it weight-down onto a dry, ungreased, extremely hot cast-iron pan. The objective is not a light sear but a full, deep char: the exterior must be smoking, blackened in places, and thoroughly caramelised across every surface, while the interior remains completely raw and cold. Timid heat produces only a sear; the smoky, Maillard-complex crust is the definition of tataki.
4. 4
   Immediately plunge the charred fillet into the ice water. Hold it submerged until the exterior is cold to the touch — typically 20 to 30 seconds. Any delay allows carryover heat from the charred crust to begin cooking the interior, which destroys the raw-to-charred contrast that is the technique's entire purpose.
5. 5
   Lift the fillet from the ice water and dry it thoroughly and carefully with clean cloth or paper. No surface moisture should remain, or the garnishes will not adhere and the ponzu will be diluted at service.
6. 6
   Slice the fillet perpendicular to the muscle fibres into pieces of 1 to 1.5 cm thickness. Each slice must show a visible, distinct band of charred exterior giving way to a raw, deep-red interior. Pieces sliced thinner than 1 cm lose the contrast that demonstrates the technique.
7. 7
   Arrange the slices on a chilled plate. Lay thin garlic slices, grated ginger, sliced myoga, and green onion across the fish; scatter the katsuobushi over all. Spoon the rested ponzu directly over the plate at the moment of service. The katsuobushi should tremble in the rising warmth of the charred fish — confirming the fish is still warm at the crust while cold within.