Originally Posted by larryace
What is the dark green crap on that hot dog?
Larry, that's "neon relish." It's one of the staple ingredients of a Chicago hot dog. Here's the full list from the Wikipedia article:
A Chicago-style hot dog, or Chicago Dog, is a steamed or water-simmered all-beef frankfurter on a poppy seed bun, originating from the city of Chicago, Illinois. The hot dog is topped with yellow mustard; chopped white onions; bright green sweet pickle relish; a dill pickle spear; tomato slices or wedges; pickled sport peppers; and a dash of celery salt. The complete assembly of a Chicago hot dog is said to be "dragged through the garden" due to the many toppings.
The canonical recipe does not include ketchup, and there is a widely-shared, strong opinion among many Chicagoans and aficionados that ketchup is unacceptable. A number of Chicago hot dog vendors do not even offer ketchup as a condiment, while those who do often use it as a litmus test