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Mustard's boasts outposts in both Boulder and Denver, walk-up operations that turn out hot dogs, Polish sausages, burgers and veggie options of many different origins and varieties – and have been doing so for four decades. Mustard’s does a proper Chicago dog, topping Vienna beef with mustard, tomato, relish, sport peppers and celery salt, and that's what we like to order. But if you're looking for a chili-and-cheese-smothered weiner, Mustard's is a solid bet. And both locations get bonus points for their vegetarian and vegan options.