Beer-Braised Bratwurst & Onions

Bahan-bahan (6 porsi)

• 2 tablespoons vegetable oil
• 6 bratwurst ((see note))
• 2 medium yellow onions, (thinly sliced)
• ½ teaspoon salt
• 1 (12-oz) bottle lager beer (see note)
• 6 hoagie rolls or hot dog buns
• Coarse grain mustard
• Warm sauerkraut