Hot roast beef, mature cheddar cheese, and a buttery horseradish-dijon sauce combine for this delectable baked sandwich combination that is served on soft Kaiser rolls!! A classic! Perfect for luncheons or entertaining, or packed into picnic lunches; great served warm, or at room temperature. Use as much roast beef and cheddar cheese as you like! Sandwiches are easily made up in advance and individually wrapped in foil, then refrigerated or frozen (use a freezer bag) for later use. Defrost overnight in the fridge, then bake as directed. Or, if frozen, bake at 300 F for about 1/2 hour until warm. Enjoy!