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Burger 21 is a "beyond the better burger" fast-casual franchise concept with offerings including 21 unique chef-inspired burger creations ranging from hand-crafted, freshly ground beef to chicken, turkey, shrimp and tuna burgers, made-to-order salads, Hebrew National all-beef hot dogs, hand-breaded chicken tenders and an extensive shake bar including hand-dipped shakes, floats and sundaes....