A melt sandwich is a type of sandwich consisting of bread, some sort of filling, and a layer of cheese, often grated. The sandwich is then grilled or fried until the cheese is melted. It may be served as an open face sandwich or a closed face one. One common filling is tuna, with or without mayonnaise; the result would then be a tuna melt sandwich. Other popular choices are ham or a hamburger, which is known as a patty melt. It is the filling that establishes the melt sandwich as a variation of the grilled cheese sandwich.
