Your first step will be rinsing your meat. Remember to always wash your meat( with exception of ground meats) before cooking. Once your meat if rinsed, place it on a clean surface.
Pour on your mustard all over your country style ribs, making sure you coat all surfaces. Once the meat if coated, sprinkle on your seasonings.
Place your meat on your desired cookware, leaving approximately an 1/2 between each rib.
Pour 1 cup of root beer into the pan. Make sure you do NOT pour the root beer directly over the meat, otherwise you will wash away some seasonings.
Leave your meat uncovered and place your meat in the oven on 325 for 2 1/2 hours.