<Tr> <Td_colspan="2"> Cookbook: Melt sandwich Media: Melt sandwich </Td> </Tr> <P> A melt sandwich is a type of sandwich containing bread, cheese (sometimes grated) and some type of filling such as meat or vegetables . The sandwich is then heated until the cheese is melted . It may be served as an open face sandwich or a closed face one . </P> <P> One common filling is tuna with mayonnaise; the result is a tuna melt sandwich . Other popular choices are ham, roast beef, chicken, turkey, or a hamburger patty, which is known as a patty melt . It is the filling that establishes the melt sandwich as a variation of the grilled cheese sandwich . Patty melts were a staple of the traditional U.S. diner and were commonly found on menus as far back as the 1950s and possibly the 1940s . </P>

When does a grilled cheese become a melt