Source: https://www.thedailymeal.com/eat/biggest-food-debates
Chicagoans like a lot of things on their hot dogs. The typical Chicago-style dog comes with yellow mustard, green relish, chopped onion, a dill pickle spear, sport peppers, tomato and celery salt. But ketchup? Forgeddaboutit. In 2017, Heinz tried to market ketchup as "Chicago dog sauce" to Windy City residents, who were not buying it. However, sports stadiums in Chicago still do have the condiment on hand if you're willing to weather some judgemental side-eye while dressing your dog. You also won't find ketchup on traditional New York-style dogs, which are usually topped with sauerkraut and mustard, in the German style.
In your opinion, Does ketchup belong on a hot dog?