This topic came up at my Memorial Day BBQ. Ketchup should never be put on a hot dog. A hot dog should have mustard on it. It doesn't matter if its yellow or brown......even the pretentious "Poupon" is fine. But after the age of 3, you should never cut a dog into nuggets or put ketchup on it. Accoutrements for a hot dog are: Chili, Onions, sauerkraut, peppers, or relish. Salsa, mac and cheese, or crushed Dorito's are also acceptable. Jury is still out on Bacon. ***Vinegar base BBQ is not BBQ, but that backyard culinary faux pas is not as pressing of an issue.