Vegetarian Hoagie Sandwich

Start with a good hoagie bun. This sandwich's success or failure rests on the quality of the bun.
On the bottom of the bun spread a layer of spicy pizza sauce, and cover with shredded mozzarella. Heat until cheese is melted. On the top part of the bun, spread melted butter, toast the bun, and then spread mayonnaise on the top half. When your bun is finished, layer fresh sliced mushrooms, green and black olives, green peppers, onion, tomato slices, and shredded lettuce.