Duchesse potatoes are creamed potatoes with beaten egg added, piped into small mounds and baked until golden — the classic French garnish potato. Hot mashed potato is enriched with butter and egg yolks, seasoned, and forced through a star nozzle into rosettes, swirls, or borders; the egg sets in the oven’s heat, fixing the piped shapes into crisp-edged, fluffy-centred morsels with burnished tops. They exist for presentation — edging a platter, accompanying a roast, turning a simple meat-and-potatoes plate into something restaurant-worthy. The technique demands a dry, smooth mash: wet potatoes slump, and the piping must be confident. Duchesse belongs to classical garnish cookery, where the potato was sculpted as carefully as the meat it accompanied, and it still appears wherever traditional plating survives.