Original Philly Cheese Steak: South Cow (Sandwich Only)(Slang Sauce contains sodium bisulfate & all food is cooked near & around shell fish) Philly Cheese Steak A grilled sirloin patty that is finely chopped, and topped with Swiss Cheese, covered with all toppings including: sauted green peppers, onions, and mushrooms on a buttered grilled hoagie roll. Extras topping upon checking the box for extras but sandwich comes with all toppings. (includes 3% service fee)