Cassoulet is a rich, slow-cooked stew originating in southern France. The food writer Elizabeth David described it as "that sumptuous amalgamation of haricot beans, sausage, pork, mutton and preserved goose, aromatically spiced with garlic and herbs". It originated in the town of Castelnaudary in the Aude department in the Occitanie region. Variants of the dish are local to other towns and cities in the Aude.

A casserole is a kind of large, deep pan or bowl used for cooking a variety of dishes in the oven; it is also a category of foods cooked in such a vessel. To distinguish the two uses, the pan can be called a "casserole dish" or "casserole pan", whereas the food is simply "a casserole". The same pan is often used both for cooking and for serving.