St. Louis-style pizza is a thin crust pie which is a variant to Chicago style, and is popular in and around St. Louis, Missouri and southern Illinois. The most notable characteristic of St. Louis-style pizza is the distinctively St. Louisan Provel cheese used instead of (or rarely in addition to) the mozzarella common to Chicago-style thin crust. The toppings usually consist of fresh ingredients sliced instead of diced. It is common for the pizza to be topped with large pieces of onion, round slices of bell pepper, and full strips of bacon. If ordered with sausage or hamburger, the meat is squeezed off by hand into marble-sized chunks. The crust is thin enough that it becomes very crunchy in the oven and is sometimes compared to a cracker. Even though the crust is round, it is always cut into small squares.