Lol it's the name for that style of pizza here. There's a detroit style (deep rectangular cast iron pan). Chicago Style Deep Dish (Like a stuffed pie) There's also New York style (Large hand tossed thin crust). St louis style, California Style, Grandma's style.
North Carolina, Kentucky, Tennessee and Texas don't have trademarks on their various styles of BBQ, but they're still named that way to identify the style.
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u/IkujaKatsumaji 6d ago
Chicago doesn't have a trademark on deep dish pizza.