If you wish to precook your bratwurst before grilling or pan-frying them, you can boil them in either beer or water. Boiling the bratwurst will cook the inside through and allow you to cook the outside to a perfect finish, as raw bratwurst would burn on the outside before cooking all the way through if prepared on a grill or skillet. Adding a few extra ingredients to the boiling liquid will infuse the bratwurst with flavor and make for an even better eating experience.
Pour 3 cans of beer or 36 oz. of water into a large soup pot. Add one sliced onion and four chopped garlic cloves.
Bring the mixture to a boil and add 1 lb. of bratwurst that have been pierced with a fork to prevent splitting. When the mixture comes back to a boil, reduce the heat to low.
Allow the bratwursts to simmer for 20 minutes. Drain them before cooking using your preferred method.