St. Louis pizza
St. Louis–style pizza is a type of pizza in St. Louis, Missouri and surrounding areas. The pizza has a thin cracker-like crust made without yeast, topped with sweet tomato sauce and Provel cheese, and is cut into squares or rectangles rather than wedges. St. Louis–style pizza is available at local restaurants and chains such as Imo's Pizza. Frozen St. Louis–style pizzas are sold at local supermarkets such as Schnucks and Dierbergs Markets. The crust is made without yeast, as opposed to Chicago-style pizza or New York–style pizza, yielding a crisp and cracker-like crust.
Source: Wikipedia