A roast beef sandwich is a simple yet delicious sandwich. It is made with a delicious dressing, roast beef, cheese, vegetables, and rye bread. It is easy to make and gets ready in no time.
In a bowl, mix mayonnaise, horseradish, mustard, poppy seeds, and onions.
Spread the dressing on the inner sides on Rye Bread. Put provolone, roast beef, American cheese, tomato, ringed onion, lettuce leaf on one slice of the bread. Top it with the other slice of bread.
Wrap the bun with foil and put it inside the oven. Bake it for 10 minutes.