Ask for ketchup on a real Chicago dog and don't be surprised if the vendor refuses — it's considered such a mismatch that plenty of stands simply won't put it on.
An all-beef frank sits in a steamed poppy-seed bun and gets 'dragged through the garden' — yellow mustard, chopped white onion, bright green relish, a pickle spear, tomato wedges, pickled sport peppers, and a dash of celery salt, all without ketchup. Cart and stand vendors across Chicago build it the same exacting way.
Philly Cheesesteak
Spam Musubi