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Grandpa's Burger Haven, located at 23 S Federal Blvd Denver, CO 80219, is a classic old-fashioned burger stand that offers large hamburgers like Hamb and Cheese, as well as a variety of mains including fries, onion rings, crispy chicken, and more. This grab-and-go spot provides fast service and delicious shakes, making it a favorite among locals. Reviewers rave about the crispy fries, juicy burgers, and friendly service, with some even calling it the most old-school burger joint in Denver. With a menu filled with nostalgic favorites and a cozy outdoor seating area, Grandpa's Burger Haven is the perfect spot for a quick and satisfying meal that will leave you feeling satisfied and nostalgic for more.