Prick the bratwurst all over with a fork. In a medium pot, combine the bratwurst, beer, and half the onions. Bring to a simmer over medium-high heat. Simmer about 15 minutes or until bratwurst are firm and cooked through. Transfer the bratwurst to a plate. Reserve some of the cooking liquid.
Meanwhile, in a large skillet, heat the oil over medium-high heat. Add the remaining onions and the bell peppers. Cook about 15 minutes or until very soft, tossing occasionally. Add the bratwurst to the skillet in the last 5 minutes of cooking to lightly brown. If the vegetables begin to get too dark, add a few tablespoons of the bratwurst cooking liquid. Season, to taste, with salt and black pepper.
To serve, spread each bun with mustard. Fill each bun with a brat. Top with sauteed peppers and onions.
"The Deen Bros. Cookbook: Recipes from the Road" by Bobby Deen, Jamie Deen and Melissa Clark © Houghton Mifflin Harcourt 2007
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