Stiglmeier Bratwurst for all your grilling needs. Try a 4 pack of these top rate Cooked Bratwurst from Stiglmeier Sausage Co of Illinois! The brats are fully cooked in a natural casing and ready to eat. At Stiglmeier, we make our bratwurst from a delicious blend of pork and veal, ground to a medium-coarse texture and fully cooked in natural casings with no nitrites. Cook over low to medium heat, turning often to keep the casing from splitting.