Beer-Braised Bratwurst & Onions

Instructions

1. In a large (12-inch/30-cm) cast iron skillet or nonstick pan with a tight-fitting lid, heat the oil over medium-high heat. Add the bratwurst and sear until nicely browned, 2 to 3 minutes per side. Using tongs, transfer the sausage to a plate; set aside. Add the onions and salt to the skillet and cook, stirring frequently, until the onions are softened and golden brown, about 5 minutes (do not burn; reduce the heat if necessary).
2. Place the bratwurst back in the pan on top of the onions, add the beer, and bring to a boil. Reduce the heat to low, cover with the lid, and simmer for 10 minutes (at this point the sausages will be partially cooked through). Remove the cover, increase the heat to medium, and continue cooking until the bratwurst are cooked through and the beer is reduced by about three quarters, 10 to 12 minutes more. Serve the bratwurst and onions on rolls with mustard and sauerkraut, if desired.