A sanwich toaster is an electrical appliance used to toast sandwiches. Ordinary kitchen units generally consist of indented hot plates, clamped together around the sandwich. Usually two sandwiches can be toasted at a time. The plates are heated by electrical coils inside the appliance. Usually the exterior is somewhat separate from these to ensure the outside of the unit does not get too hot. The plates often clamp tightly around the edge of the sandwich, sealing in the filling. The use of a special sandwich toaster seals the edges of the sandwich and places a diagonal line across it, thus solving the problem of content spillage. Typical toasted sandwiches are a grilled cheese sandwich, tuna melt, or patty melt.