A croque monsieur is a classic French sandwich made with ham and cheese, typically Gruyère or Emmental. The sandwich is assembled with slices of bread, layered with ham and cheese, and then grilled or baked until the cheese melts and the bread is golden brown. It is often served with a side of salad or fries. In some variations, a croque madame is created by adding a fried or poached egg on top of the sandwich. This dish is popular in cafés and bistros across France and is enjoyed as a hearty breakfast or lunch option.