Detroit-style pizza is a style of pizza developed in Detroit, Michigan. It is a square pizza similar to Sicilian-style pizza that has a thick deep-dish crisp crust and toppings such as pepperoni and olives and is served with the marinara sauce on top. 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 Rather, industrial parts trays are often used, which were originally made to hold small parts in factories.
The crust of a Detroit-style pizza is noteworthy because in addition to occasionally being twice-baked, it is usually baked in a well-oiled pan to a chewy medium-well-done state that gives the bottom and edges of the crust a fried/crunchy texture. Some parlors will apply melted butter with a soft brush prior to baking.
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