Detroit-style pizza is a style of pizza developed in Detroit, Michigan. It is a square pizza that has a thick deep-dish crisp crust and toppings such as pepperoni and green peppers, and is generally served with sauce on top of the cheese. The square shaped pizza is the result of being baked in a square pan, which is often not a pizza pan. Rather, industrial parts trays are often used, which were originally made to hold small parts in factories.