Hamo no Otoshi

Kyoto sits inland, far from the sea, yet hamo became one of its defining ingredients precisely because the fish is exceptionally hardy. In the centuries before refrigeration, peddlers carried fish from the Seto Inland Sea and Osaka Bay over the mountains in tubs of seawater; most fish spoiled in the summer heat, but hamo could survive the journey and arrive in Kyoto still alive. Its peak coincides with early summer after the rainy season, the same weeks as the July Gion Matsuri, so the festival is popularly nicknamed the Hamo Festival and the fish served then is called festival hamo. The honekiri bone-cutting technique developed in Kansai kitchens specifically to make this bone-laden fish edible, and chefs are said to need close to a decade to master it. The precise inventor and date of the technique are unrecorded.

Cold, with a firm yet tender bite that gives way cleanly; the white flesh has flared into delicate curled petals, glossy and faintly sweet, while the skin adds a slight chew. Properly bone-cut hamo carries no perceptible bones at all — the fragments simply dissolve in the mouth. The plum sauce or ponzu cuts the richness with a sharp, clean acidity that lifts the mild flesh. Poor honekiri betrays itself instantly: stray slivers of bone prick the tongue, and flesh that was over-blanched turns dry and stringy rather than blooming open.

Hamo flesh is riddled with fine, hard intermuscular bones that cannot be filleted out, so the honekiri knife severs them in place: the blade descends through the flesh at intervals of roughly one cut per millimeter — many cuts across each sun (about 3 cm) — stopping just short of the skin, which holds the fillet together while the bones are chopped into fragments small enough to be unnoticeable. The brief hot-water blanch (yubiki, around 80°C) denatures the surface proteins of the cut flesh; because the muscle was scored, the contracting fibers pull each segment outward and the fillet curls open into the peony shape. The immediate ice-water shock halts cooking and firms the texture by tightening the proteins, leaving the interior just-set rather than overcooked. The acidity of ume (from citric and malic acids in the pickled plum) and of ponzu (citrus) brightens the mild, lean summer flesh and balances its faint sweetness.