A gratin dish is an oval-shaped dish with handles on either end. A gratin dish is safe for oven use and is also suitable to serve food from. In a gratin recipe, the cook tops the dish with breadcrumbs or cheese and bakes it to a golden brown.
Cooking a dish in the au gratin style means the meal is made from scratch or that several ingredients are mixed together to create a casserole-like dish. While potatoes au gratin is the most popular gratin recipe, many ingredients are suitable for this preparation style, including asparagus, cauliflower, fish, leeks, mushrooms and seafood.