1.Preheat The Oven Broiler. Line A Baking Sheet With Aluminum Foil. 2.Open The Sandwich Roll Onto The Prepared Baking Sheet. Spread The Mustard-Mayonnaise Blend On One Half Of The Roll And Top With The Turkey, Swiss Cheese, And Ham. 3.Spread 1 Tablespoon Of Mayonnaise On The Other Half Of The Roll And Top With The Roast Beef, Tomato Slices, And Muenster Cheese. 4.Broil The Sandwich Open-Faced Until The Cheese Melts And Begins To Bubble And The Ham Begins To Crisp Around The Edges. Remove The Sandwich From The Oven And Put Both Sides Together.