Carlitos is a traditional sandwich originating from Rosario in Argentina. This simple sandwich is usually made with a combination of sandwich bread, ham, cheese such as mozzarella (or similar cheese that melts well), butter, and ketchup. The slices of bread are buttered, topped with a cheese slice, a dollop of ketchup, a slice of ham, and another slice of cheese.

The sandwich is finished with the other buttered slice of bread placed on top. Once assembled, carlitos are toasted on each side, cut into triangles, and served warm. Nowadays, there are also variations with olives, eggs, chicken, and peppers.