Chicago hot dogBeeZers, 277 Main St., NorthboroughThe signature frank is the Chicago hot dog ($3.95), an all-beef frank served in a poppyseed bun and topped with yellow mustard, bright-green relish, chopped onions, tomato slices, cucumber slices, a crisp dill pickle spear, and a sprinkle of celery salt.http://www.beezershotdogs.com/.