Illinois is famous for its culinary contributions, with Chicago deep-dish pizza leading the pack. This hearty, cheesy delight, with its thick crust and layers of toppings, is a must-try. Another iconic dish is the Chicago-style hot dog, fully loaded with mustard, onions, sweet pickle relish, a dill pickle spear, tomato slices, pickled sport peppers, and a dash of celery salt, but never ketchup. These dishes offer a taste of the state's rich culinary traditions.