This roast beef sandwich can be made using deli beef or if you have leftover beef it is a wonderful way to make a tasty lunch.
Preheat the oven to 325 degrees F.
To warm meat warm, steam the beef with a very small amount of water in a covered skillet on the stovetop.
Heat for 2-3 minutes. Place the thinly sliced cheese on top of the beef. Cover with a lid and turn off the heat.
Cut buns partialy through lengthwise.
Butter and spread a little horseradish on each bun.
Use tongs to place the sliced beef and cheese into buns.
Season with salt and pepper to taste.