CHICAGO (CBS) -- Jon Stewart may have called deep-dish pizza a "casserole" on a rant a little over 10 years ago – but Chicagoans have no need to be defensive about a favorite delicacy.

It's National Deep Dish Pizza Day! To celebrate the owners of Gino's East of Chicago joined us live with a taste preview of some of their best sellers. For more information visit ginoseast.com.

Cherry Cheesecake Day, Deep-Dish Pizza Day and Burrito Day to name a few. There are also more serious recognitions throughout the month including Marine Mammal Rescue Day, National Adopt A Shelter ...

Billions of pizzas are sold across the planet each year - there's even an official World Pizza Day every year on 9 ... Their invention was deep dish pizza, prepared in an oil-coated pan.