Cheese Veggie Sandwich

What is it?

Built on a toasted bun, this vegetarian sandwich pairs grilled onions, mushrooms, and green peppers with melted American cheese. It comes without meat, and the fillings are stacked in the same simple format Five Guys uses for its burgers, just pared back to vegetables and cheese. Unlike the chain’s beef sandwiches, there’s no patty here, so the bun carries most of the structure. The vegetables are cooked on the grill, which softens them and gives a little browning, while the cheese melts into the folds and ties everything together.