Roast beef sandwich

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