A Chicago Style Hot Dog is a unique type of hot dog that originates from Chicago. It is traditionally made with an all-beef frankfurter served in a poppy seed bun. The hot dog is topped with a variety of ingredients, including yellow mustard, chopped onions, sweet pickle relish, a slice of tomato, a dill pickle spear, and sport peppers. One distinctive feature of the Chicago Style Hot Dog is that it is never served with ketchup, as this is considered a culinary faux pas in the city. The combination of toppings creates a flavorful and colorful experience, making it a beloved staple of Chicago cuisine.