Prepare the cheese, rolls, and seasonings for building the sandwiches.
Heat the Evo grill to Medium to Medium High.
Sauté the onions, peppers, with vegetable oil, salt, pepper, and red pepper flakes. Once ingredients begin to caramelize then add the beef .
Toast the rolls in some butter and top them with Provolone cheese. Add the sautéed beef, onion, and pepper mixture and top with another slice of cheese.