Preheat the oven to 350 degrees F.
Slice the rolls in half and place the bottom half of the rolls in a 13-by-9-inch baking dish. Season the bread with the steak seasoning and arrange the roast beef on top in mounds. Top with the shredded Cheddar.
In a medium bowl, combine the provolone, mayonnaise and scallions. Spread this mixture on the cut sides of the top portion of the rolls. Place the tops spread-side down in the dish on top of the Cheddar.
Mix the butter, onion, Parmesan, Worcestershire and red chili flakes in a bowl. Pour over the top of the rolls. Cover with foil and bake 25 minutes. Remove the foil and place a pepper slice on top of each sandwich. Bake 5 minutes more to toast the roll tops. The sandwiches will be extremely hot; rest a few minutes before serving.