Japan — hamo has been a Kyoto summer staple since the Heian period, when it was one of the few seafood that could survive transport from the coast (Osaka/Wakayama) to the inland capital without refrigeration — hamo is notably hardy and survives in minimal water. The Gion Matsuri festival (July) is called the 'hamo festival' because hamo appears on every table during the festival season.
Hamo (鱧, Muraenesox cinereus, pike conger or daggertooth pike conger) is the defining fish of the Kyoto summer culinary calendar — a large, snake-like eel-relative with exquisite, delicately flavoured white flesh marred by hundreds of tiny inter-muscular bones that cannot be removed by filleting. Kyoto's relationship with hamo is the defining example of Japanese technical skill applied to an ingredient challenge: the specific hamo honegiri (骨切り, bone-cutting) knife technique — 26 cross-cuts per 3cm of flesh, cutting through all bones without cutting through the skin — transforms the bone-riddled fish into a preparation where all bones are finely cut into segments short enough to be harmlessly eaten. A Kyoto hamo chef trains for years to achieve the rhythmic, precisely spaced cuts at the correct depth. The fish is synonymous with the Gion Matsuri festival (July).
Hamo's flesh has a specific quality: delicate, very white, clean-flavoured, with a mild sweetness and a fine, somewhat firm texture that distinguishes it from the fattier eel (unagi). Blanched botan hamo served cold with plum sauce: the fish's delicacy needs no strong seasoning — the ume's sharp, sweet-sour character provides brightness against the hamo's mild marine sweetness. Grilled hamo with a light soy baste develops slightly caramelised edges while the inter-muscular bone cuts allow even heat penetration — the result is a uniformly cooked, tender fish with no bone issues.
Hamo bone-cutting technique: the yanagiba or hamo-bocho (専用包丁, dedicated hamo knife) is drawn through the flesh in rapid, even strokes at 3mm intervals, cutting to within 1–2mm of the skin. The knife does not pierce the skin — the intact skin holds the fillet together while the flesh bones are completely cut. After bone-cutting, the hamo is used as: (1) botan hamo (牡丹鱧) — plunged briefly into boiling water, causing the sliced portions to curl into a peony flower shape; served cold with plum sauce (baikan); (2) hamo no yaki-mono (grilled, with watery baste); (3) hamo nabe (hot pot).
The botan hamo presentation is one of Japanese cooking's most theatrical seasonal preparations: immediately after blanching in boiling water, the bone-cut fillet segments curl rapidly into petal shapes, transforming a flat fillet into a three-dimensional flower. The technique requires plunging the bone-cut hamo into boiling water skin-side up, then removing in 15–20 seconds before the skin can contract and prevent the curling. Only Kyoto hamo is considered the finest — the fish from the inland sea delivered via Osaka to Kyoto through the pre-refrigeration era established Kyoto's hamo tradition, and it remains the most prestigious hamo source.
Insufficient cutting density — cuts spaced more than 3mm apart will leave segments of bone that are noticeable in the mouth; 26+ cuts per 3cm (approximately 1mm spacing) is required. Cutting through the skin — the intact skin is essential for the botan hamo presentation where the cuts curl into petals when blanched.
Kaiseki: The Exquisite Cuisine of Kyoto's Kikunoi Restaurant — Yoshihiro Murata; Japanese Cooking: A Simple Art — Shizuo Tsuji