Heinz Pranks Chicagoans Into Eating 'Forbidden' Hot Dog Sauce

A Chicago-style hot dog features plenty of toppings: yellow mustard, an almost neon-green relish, chopped onions, tomato wedges, a pickle spear, sport peppers, and a dash of celery salt. But one is clearly absent: ketchup. In fact, asking for a hot dog with ketchup at some Windy City establishments will get you an order of side eye.