Lunch south of St. Louis?
I think you are going to be very hard pressed in those areas. However, along 55 into the city is a good place called iron Barley. It has been on Man vs Food and maybe on DDD.
The Monte Cristo Dog Sammie is excellent... As well as the smoked Prime Rib...
I live in Festus and work in Pevely. There are three places I would recommend.
Not in any order. (1) Blue Owl in Kimmswick, great home cooking and atmosphere.
(2) Frankie G's in Imperial, wide selection of just good food, (3) Bobby Tom's in Pevely for BBQ Pulled Pork, Pork Steaks and Ribs are good. Enjoy!