in NY-- they are "dirty water dogs" sold by street venders, (who are regularly inspected by Health Dept.) and usually come up cleaner than most "established" restaraunts. but they are still dirty water dogs.

they come with mustard (golden yellow, or spicy dark -- vendors choice) sourkraut, and or onions in hot red chili sauce. pickle relish is available, too. most people only get one or two condiments, but no extra charge for relish, kraut, onions and mustard.

they used to offer sides of knishes, but the self same Dept of Health decided they couldn't keep them hot enough to keep them safe.. but you still can get a pretzle, as salty as you like, plain or with mustard.