• Sliced Muenster or provolone cheese
Preheat oven to 325 degrees.
Split the rolls horizontally not quite all the way through. Place them in oven until they are warm throughout, about 5 to 6 minutes. Bring 3 cups au jus to a simmer. Add thinly sliced roast beef and simmer for 1 minute to just warm the beef. Remove the beef and divide it among the warm rolls. Add any accompaniments desired and serve with cups of hot au jus for dipping.
To make Creamy Horseradish Sauce: In a medium bowl stir together 1/4 cup prepared horseradish sauce, 1 cup sour cream, 2 teaspoons Dijon mustard, if desired, and 1/4 cup finely chopped green onions or fresh chives.