Fresh polish sausages are made of raw, semi-finely ground pork, sometimes beef or veal, and they are usually seasoned simply, with garlic, marjoram, and pepper. The key factor in considering the optimal cooking method for your kiełbasa is the "raw" part. Throwing fresh Polish sausage straight onto a hot grill is a way to get it to be cooked through to edibility, but it can cause quality-affecting problems, like burst casings or an uneven, charred exterior wrapped around a still-raw center.