White-Braised Fish Maw

扒广肚 belongs to the 白扒 family of Henan banquet cookery, in which a prepared ingredient is laid in order on a bamboo mat and braised in a pale broth so it keeps both its shape and a clean white colour. The dish is built on dried fish maw, the swim bladder of large fish, a costly dried good (also called 花胶) ranked among the 海八珍; the exact inventor and date of the dish are not on record. Its name describes the method and material plainly: 扒 is the technique of arranging the pieces, braising them slowly without stirring, and sliding them onto the plate with their order intact, and 广肚 is the trade name for a grade of fish maw. The 白扒 / 红扒 (white-braise / red-braise) distinction is a standing feature of Henan cooking, the white kept pale on a milk broth and the red coloured with soy; 扒广肚 is the showpiece of the white side. It was selected as one of Henan's ten classic dishes when the 'Chinese Cuisine' (中国菜) list was released on 10 September 2018.

A piece comes up soft and yielding, with a faint springy chew and a slippery, almost melting smoothness — the maw has no flavour of its own but has soaked the broth right through, so each bite tastes of the milky pork stock, savoury and gently rich rather than fishy. The sauce clings as a thin glossy white glaze, not a heavy gravy, and the ring of greens gives a fresh, lightly bitter snap against the softness. Done well the maw is fully and evenly soaked, with no hard or rubbery core and no off smell, and the whole piece holds its shape when inverted; done badly it is under-soaked and rubbery, or carries a stale fishy-oily note from poor preparation, or the broth is thin and watery instead of properly milky and the dish tastes of little.

Two things make the dish: rehydrating the maw and the white braise. Dried fish maw is almost pure collagen, hard as horn; it is reconstituted in stages — soaked, then puffed in warm oil or baked until it swells and turns spongy, then soaked again in changes of water — so the protein matrix opens into an airy, water-holding sponge that can absorb broth. A blanch removes any oil and fishy note. The 奶汤 is the flavour: pork bones, trotter and the like are boiled hard at a rolling boil, so fat and the gelatin and tiny protein particles from the bones emulsify into the water and turn it opaque and milky white — a true emulsion, not cream. Braised slowly on the mat, the spongy maw wicks this savoury emulsion in while staying pale, and a little starch at the end tightens the broth into a thin glossy coat. Low heat and no stirring are essential: the soft maw breaks easily, and the bamboo mat lets the assembled piece be turned out whole, its arrangement intact.