Past tense of casserole; cooked slowly in a casserole dish, typically with liquid and various ingredients combined together.
From French casserolle (cooking pot), derived from Italian cazzaruola; the verb form emerged in English in the 20th century as the dish became a standard part of home cooking.
The casserole became iconic American comfort food after World War II when busy families needed one-dish meals, but the cooking method itself goes back centuries to French peasant cuisine where you'd throw everything in one pot to simmer.
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