2. In a saucepan, add the brats, beer, and sliced onion. Bring to a boil and then reduce to a simmer for about 10 minutes.
3. Remove the brats from the beer mixture and place them on the grill. Grill for about 10-15 minutes, turning occasionally, until they are browned and cooked through.
4. Serve the brats in hot dog buns with your favorite toppings.