A croque monsieur (French pronunciation: [kʁɔk məsjø]) is a hot sandwich made with ham and cheese.

[2]In the early 1900s, bistro owner Michel Lunarca [fr] popularized the name croque-monsieur by satirically using it after being accused of having human meat in his pork sandwiches.

[3] A croque monsieur is traditionally made with baked or boiled ham and sliced cheese between slices of pain de mie, topped with grated cheese and lightly salted and peppered, and then baked in an oven or fried in a frying pan.

The name croque-mademoiselle is associated with its lighter, vegetarian version: made of the same bread, but with ordinary melting cheese, accompanied with chives, cucumber and lettuce.

In the United States, the Monte Cristo (a ham-and-cheese sandwich often dipped in egg and fried) is popular fare in diners.