Deep dish pizza gets argued about more than almost any food in America — plenty of people insist it isn't really pizza at all, it's a casserole with a crust. Chicagoans have heard this argument a thousand times and mostly don't care. Here's what it actually is, where it came from, and where to get it.

Where deep dish actually came from

Deep dish was invented at Pizzeria Uno in 1943, credited to founders Ike Sewell and Ric Riccardo. The idea was a heartier, knife-and-fork pizza built in a round steel pan with tall edges — crust pressed up the sides like a pie crust, then layered upside-down from tradition: cheese first, then toppings, then a chunky tomato sauce on top so it doesn't burn during the much longer bake time deep dish requires.

Deep dish vs stuffed pizza: they're not the same thing

This trips up a lot of visitors. Deep dish has one layer of dough on the bottom. Stuffed pizza — associated with Giordano's and Nancy's — adds a second, thinner layer of dough on top of the fillings before the sauce goes on, essentially making it a pizza pie. Both are Chicago inventions, but they're different categories, and ordering one expecting the other will throw you off.

The main spots people actually argue about

What to actually expect

Deep dish takes 30-45 minutes to bake — this is not a place to go if you're in a hurry, and most deep dish spots want you to order the moment you sit down because of that lead time. A single deep dish pizza is dense enough that a "personal" size can realistically feed two people, so pace your ordering accordingly.

Deep dish isn't trying to be Neapolitan pizza's cousin — it's a completely different food that happens to share a name.

A tip for avoiding the tourist trap version

The most famous names get the longest lines and the most tourist traffic, which is fine, but Chicago has dozens of neighborhood deep dish spots with loyal local followings and zero wait. If you're staying more than a day or two, it's worth asking a local for their actual neighborhood pick rather than only hitting the famous names.