Bratwurst is a type of fresh sausage similar to Italian sausage, but with very different seasonings. Originating in Germany, bratwurst tends to be sweeter and is typically seasoned with margoram, nutmeg, coriander,  or ginger. Using bratwurst for this recipe would also be delicious, just with a very different flavor profile. If swapping out the sausage for bratwurst, use sour kraut as a topping.