Uno's original pizza chef Rudy Malnati has also been credited for development of the recipe. Rudy's sons Lou and Rudy Jr., who also worked at Pizzeria Uno, later respectively founded Lou Malnati's Pizzeria in 1971 and Pizano's in 1991, both also known for their deep-dish pizzas.
There is also a style of thin-crust pizza known as "tavern style". Residents of two cities claim to have originated it in the 1940s: Milwaukee and Chicago.
This pizza has a crust firm enough to have a noticeable crunch and the slices are cut into squares, as opposed to wedges. The name "tavern-style" comes from the pizzas originally being served in taverns, often as an enticement to drink alcohol. This origin in taverns is also linked to the pizza's shape, as the square shape of the slices made it possible for taverns that did not have plates to instead set them on napkins.
The typical toppings commonly found on pizzas in most of North America (such as sausage, pepperoni, onions, and mushrooms) are also standards in Chicago-area pizzerias. A survey in 2013 indicated that while the most popular pizza topping in most of the United States is pepperoni, in Chicago the most popular topping is Italian sausage.
Media related to Chicago-style pizzas at Wikimedia Commons
Deep Dish Pizza at the Wikibooks Cookbook subproject
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