To cook or serve food in a casserole dish.
From en- (put into) + casserole (a cooking dish and the food cooked in it, from French 'casse' meaning 'ladle'). This is a rare or specialized culinary term.
This word is quite uncommon in modern English, but it represents how cooking terminology has created specific verbs for specific dishes—if we still used it frequently, you might say 'I encasserolled the chicken for dinner!'
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