Chicago-style hot dog's history begins with street cart hot dog vendors who first started selling them during the harsh times of the Great Depression. Chicago dog was born as the vendors offered a flavorful, hot meal on a bun and started selling it for only a nickel.

Vienna beef hot dog was placed in a steamed poppyseed bun, then topped with numerous ingredients—green relish, yellow mustard, fresh, diced onions, red tomato slices, kosher pickles, a bit of pickled peppers, and a sprinkle of celery salt. The customers absolutely loved the unique combination of hot and cold, crisp and soft, sharp and smooth, and the hot dogs became an authentic icon of the city.

The Chicagoans opted for no ketchup, and it is still considered unacceptable, so much that a large number of hot dog vendors don't even offer it as a condiment. A final proof of its popularity is evident in the fact that the Chicago area has more hot dog restaurants and stands than McDonald's', Burger Kings, and Wendy's' combined.