Casserole represents an unusual naming pattern: a food named for its container. In French, casserole still means primarily "saucepan" — the transfer of meaning from cooking vessel to cooked food happened predominantly in English. This metonymic shift (naming the contents after the container) has parallels in English: a "cup of tea" names the drink by its vessel, and "potluck" names the meal by the pot.
The etymological chain runs from French casserole ("saucepan"), through Old French casse ("ladle, dripping pan"), to Old Provençal cassa, and ultimately to Late Latin cattia or Greek kyathion (a diminutive of kyathos, "cup, ladle"). The Greek kyathos was a standard unit of liquid measurement in ancient Athens, as well as the name for the long-handled ladle used to serve wine from a krater (mixing bowl) at symposia. The connection between an Athenian wine ladle and a Midwestern tuna casserole is one of etymology's more improbable chains.
The casserole as an American cultural institution has a specific history. While slow-cooked one-pot meals are universal across cultures, the distinctly American casserole — combining protein, starch, vegetable, and a creamy binding sauce (often canned condensed soup) — crystallized in the mid-20th century. The Campbell Soup Company played a pivotal role, promoting recipes that used its condensed soups as convenient casserole bases. The most famous of these — the Green Bean Casserole — was created
The casserole's mid-century popularity reflected social changes: women entering the workforce needed meals that could be assembled quickly, placed in the oven, and left largely unattended. The casserole solved this practical problem while also serving as a vehicle for community — the "casserole brigade" that delivers food to families in crisis is a recognized social ritual in American life.
Spanish cazuela — from the same root family — names both the earthenware cooking pot and the dishes prepared in it, maintaining the same container-to-contents metonymy. The cazuela tradition of Chile, with its clay pot soups and stews, parallels the American casserole culture in its emphasis on hearty, one-vessel cooking.