There are a couple classic burger joints in St. Louis...Carl's Drive in is always fun. 16 seats, 8 or each side of an open kitchen, and they make their own rootbeer. O'Connells has a unique style of burger. Spencer's Grill, Blueberry Hill, Trainwreck, Village Bar, etc...I'm not much on the overloaded DDD style burgers. If you want a Loose Meat Burger, Hit the Maid-Rite in Rolla, their chicken is good too.