The roast beef sandwich is a sandwich that is made out of sliced roast beef or sometimes beef loaf. It is sold at many diners in the United States, as well as fast food chains, such as Arby's and Roy Rogers Restaurants. This style of sandwich often comes on a hamburger bun and may be topped with barbecue sauce and/or melted American cheese. The roast beef sandwich also commonly comprises bread, cold roast beef (either the leftovers from a homemade dinner or deli meat), lettuce, tomatoes, and mustard, although it would not be uncommon to find cheese, horseradish, fresh/powdered chili pepper and even in some cases red onion. Roast beef sandwiches may be served cold or hot, and are sometimes served open faced.
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