These places were recommended to me by co-workers, but have not tried for myself:
http://www.irmasburgershack.com/
http://www.bunnysonionburger.com/
http://johnniesok.com/johnnies.php
http://ronschili.com/
http://littlemikeshamburgers.com/
http://www.irmasburgershack.com/
http://www.bunnysonionburger.com/
http://johnniesok.com/johnnies.php
http://ronschili.com/
http://littlemikeshamburgers.com/