A proper Chicago dog is an all-beef frankfurter (such as Vienna Beef) in a poppy seed bun, topped with yellow mustard, neon-green sweet pickle relish, chopped white onion, tomato slices, a dill pickle spear, pickled sport peppers, & celery salt. If you can’t find Chicago-style sport peppers, then sliced pepperoncini works in a pinch. Don’t skip the celery salt; its herbal lightness makes these dogs shine. And don't even think of putting ketchup on it 😁