
Put the brats, sliced onions and pepper, butter and beer in a large skillet; cover and simmer 10 minutes (use chicken broth instead of beer if you prefer).
Lift out the brats and sear them on a grill or in a separate pan 6-8 minutes, turning, until browned and 160°F.
Meanwhile boil the onions and peppers uncovered about 8 minutes until the liquid cooks off and they turn jammy.
Toast the buns, then layer in the brats, onions and peppers, mustard and sauerkraut.
Photo: DinnerDrop