Ingredients:
1 cup mayonnaise
2 cloves garlic, minced
1 tablespoon  butter
1 pound Deli Roast Beef
2 green bell  peppers, cut into 1/4 inch strips 
2 onions, sliced into rings
salt and  pepper to taste
4 hoagie rolls, split lengthwise (I buy mine and Macy's)
1 (8 ounce) mozzarella cheese (Don't buy pre-shredded, it will not melt as good)
Directions:
1. In a small bowl, combine mayonnaise  and minced garlic. Cover, and refrigerate. Preheat oven to 500 degrees F (260  degrees C).
2. Heat butter in a large skillet over medium heat. Saute  beef until lightly browned. Stir in green pepper and onion, and season with salt  and pepper. Saute until vegetables are tender, and remove from  heat.
3. Spread each bun generously with garlic mayonnaise. Divide  beef mixture into the buns. Top with shredded cheese.  Place sandwiches on a baking pan.
4. Heat sandwiches in preheated  oven, until cheese is melted or slightly browned.