Preparation / Directions:
Prepare a hot fire in a covered charcoal or gas grill (see note). While coals heat, in a large frying pan, cook the onion and pepper in the oil over medium heat until the vegetables are softened, about 3 minutes.
Add the garlic and caraway seed and cook until the onions are golden, about 2 minutes.
Add the beer and cook until the liquid is reduced in volume by about half, about 3 minutes. Season with the salt and pepper.
Remove from the heat and cover to keep warm. Split the bratwurst lengthwise, but do not cut all the way through.
Grill until nicely browned on both sides, about 8 minutes. During the last 2 minutes of cooking, set the buns, cut sides down, at the edge of the grill to toast lightly.
To serve, spread the cut sides of the buns with mustard, add a bratwurst, then spoon on the pepper and onion mixture.
To check grill temperature, count the seconds you can hold your hand, palm side down, 2 to 3 inches above the rack, until it feels uncomfortable: 2 seconds for hot.