Do you like the gooey cheesie pieces in the middle, or the crunchy slices on the outside?
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The first 1,100 people to weigh in get a free four-pack of pizza.
Pizza lovers can vote at www.AreYouInnieOrOutie.com.
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The contest comes as Lou Malnati's launches its popular Chicago thin crust pizza nationwide on TastesofChicago.com.
Thin crust was previously available only in restaurants for the past 30 years.
"Chicagoans have been passionate about deep dish and thin crust pizza for years and have debated whether their favorite piece of the square-cut Thin Crust pizza is on the inside or outside. We thought it's time we invite the rest of America to choose their side as well," said Marc Malnati, owner of Lou Malnati's.