II
The Method
1
Light the binchotan charcoal well in advance. The charcoal is ready only when the entire surface has turned to white ash — no black patches remain, no smoke is produced. Incomplete combustion at this stage introduces off-flavours that no tare can correct. The grill is ready when it radiates steady, even heat with minimal visible flame.
2
Make the tare. Combine soy sauce, mirin, sake, and sugar in a heavy saucepan. Add the chicken bones. Reduce over medium heat, stirring to dissolve the sugar, until the liquid thickens to a glaze that coats the back of a spoon and holds a line drawn through it. Remove the bones. Reserve the tare in a shallow vessel beside the grill. The tare is never fully discarded — each basting session accumulates depth from previous sessions.
3
Skewer each part according to its character. For negima: alternate uniform pieces of thigh with 3 cm lengths of negi. For kawa: fold the cold skin strips accordion-style along the skewer, compressing the fat layers together — do not stretch the skin flat. For reba: thread liver lobes so each piece sits flush and stable. For sunagimo and hatsu: skewer at consistent thickness so all pieces on a single skewer cook at the same rate. Skewering different parts at different thicknesses on the same skewer is the structural error that makes even heat management impossible.
4
Grill the kawa skewers low and slow over the cooler margin of the charcoal bed. The goal is full fat rendering before any tare is applied. The skin is ready for tare when it has contracted, the fat is visibly liquefied and dripping, and the surface has turned pale gold — it must not yet be crisp at this stage, which comes only after tare application and a final moment of contact heat.
5
Grill reba skewers over lower heat — approximately 3 minutes total. The exterior will colour quickly; the interior must remain pink and barely set. Press a skewer lightly: it should yield with slight resistance, not firm up. This is the shortest window in yakitori cookery. Over this heat, one additional minute converts a correctly pink liver to one that is chalky and dry.
6
Grill thigh (momo, negima) and heart (hatsu) skewers at medium height over the main charcoal bed, turning regularly for even colour. Gizzard (sunagimo) requires longer grilling at medium heat for its characteristic chew to soften to the correct degree — it should resist the tooth without being leathery. Each part dictates its own height and duration; treating all skewers at the same distance is the error that collapses the discipline into ordinary grilling.
7
This is where the dish lives or dies. In the final 60–90 seconds of cooking only — not before — brush tare onto each skewer with 1 to 3 applications depending on the part: reba takes 1 application to preserve the caramelised exterior without burning; thigh and heart take 2; kawa takes up to 3 to build its lacquered surface. After the last application, hold each skewer on the grill for a further 20 seconds without moving it. This contact caramelises the sugars in the tare against the heat of the charcoal. Applied too early, the sugars burn before the protein is cooked through; applied correctly, the tare glazes, sets, and forms the defining surface of each piece. The smell shifts from raw soy to a concentrated, smoky caramel at the moment of correct caramelisation.