The word Gratin can also refer to the dish in which a gratinée is baked. A gratin dish (compare prices) is flat and shaped like an oval, with handles on each end.
Vegetables like cauliflower, asparagus, artichokes, leeks or even mushrooms can be prepared au gratin. Perhaps the most popular gratin recipe is Potatoes au Gratin (also called potatoes Dauphinoise). Fish and seafood are frequently prepared au gratin as well.