I know you may be just a visitor, but it is really important that you don't put ketchup on your hot dog. the natives get really upset about this particular issue.
Yes, a real Chicago Dog, however cheapbuns are used & split at hinge instantly, everything falls thru. Cutting corners, trying to save a few cents. Dogs are pre-cooked, sitting in a pile.
Service can be a bit slow when you order something slightly unusual like a chicken sausage or turkey dog. But the cashier makes sure you're taken care of. Tasty grub
This place is a mess in the morning. Several people cut in line, they forgot my order and were suspicious when I asked about it, and the bagel was adequate if flavorless. Good coffee, though.