A Chicago Hot Dog is a type of hot dog that originates from Chicago, Illinois. It is traditionally made with an all-beef frankfurter served in a poppy seed bun. The hot dog is known for its unique toppings, which typically include yellow mustard, chopped onions, sweet pickle relish, a slice of tomato, a dill pickle spear, and sport peppers. One defining feature of the Chicago Hot Dog is the absence of ketchup, which many locals believe should never be added. This iconic dish is often enjoyed at street vendors and local eateries, making it a staple of Chicago cuisine and culture.