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Workers at Portillo's carefully place the toppings on hot dogs to fulfill orders. A Chicago-style hot dog, according to the Portillo's website, includes mustard, relish, onions, celery salt, tomatoes, sport peppers and kosher pickle on a poppy-seed bun. 

Workers at Portillo's carefully place the toppings on hot dogs to fulfill orders. A Chicago-style hot dog, according to the Portillo's website, includes mustard, relish, onions, celery salt, tomatoes, sport peppers and kosher pickle on a poppy-seed bun.