The toppings.

Really just the toppings. I guess it "needs" to be an all-beef hotdog on a steamed bun, too, but yeah really just the toppings. No idea why this guy's so upset by mustard, relish, onions, hot peppers, and tomato lol

those toppings are standard. mustard, onions, celery salt, tomato, pickle, sweet relish, and sport peppers. If it says chicago style it means that. Most places will ask if you want the peppers since people can be iffy on spice heat. Some places will ask what you want it and "drag it through the garden" means to have everything on it.

No ketchup. Evar. I'm not kidding.