Webbed feet of skin and tendon over small bones, sold whole or boned. Eaten for the chewy, gelatinous bite, they are braised in spiced stock and sold by weight at braised-snack shops, or served cold.
鸭掌 refers to the webbed foot; the gelatinous skin is the point. It's prized in hot pot, braised as a snack, or served cold with mustard - always for texture, never for meat.