Former Top Chef contender Spike Mendelsohn is behind this "popular" Capitol Hill counter serve (and newer Crystal City sibling) wooing "celebrities", "pols" and "policy wonks" with "creative", "juicy" burgers, "perfectly seasoned" fries and "unbelievably decadent" milkshakes ("heaven in a plastic cup"), all doled out "fast" in upscale-industrial "fast-food" digs; despite "limited" seating,...