We had quite a bit of prime rib left from Christmas dinner. We made these sandwiches for dinner one night and they came out great!
3 cups very thinly sliced, cooked roast beef
1 onion, sliced
2 red bell peppers, sliced
4 slices deli sliced cheese ( we used Swiss)
4 hoagie rolls, sliced in half
1/4 cup mayonnaise
1/2 teaspoon creamy horseradish
Remove the outer skin from an onion, cut in half, then make thin slices
Make long, thin slices with the red pepper
Place a couple of tablespoons of olive oil in a large saute pan and turn on to medium high heat.
Place the onions and peppers in the pan and cook about 10 minutes, until soft.
Mix mayonnaise and horseradish together to spread on sandwiches.
Place sliced rolls on a cookie sheet under the broiler until lightly toasted.
Arrange sliced roast beef on one half of the toasted rolls.
Place the cooked onions and peppers over the beef.
Then a slice of cheese on each sandwich.
Return the sandwiches to the oven, under the broiler until the cheese melts and bubbles.
Spread the horseradish sauce on one side of the bun and serve!