Bake the bratwurst: Preheat the oven to 400°F (200°C). Line a baking sheet with parchment paper.
Bake bratwurst: Rub the bratwurst with the oil and place it on the baking sheet. Bake for 10 minutes, turn with tongs, then bake for another 10–15 minutes, until browned and cooked through (internal temperature of 160°F/71°C – Note 4).4 bratwurst + 1 teaspoon oil
Warm buns: Add the buns to the baking sheet for the last 5 minutes to warm them.4 pretzel buns
Cook the sauerkraut while the bratwurst bakes. You can also make the sauerkraut ahead and reheat it before serving.
Cook the sauerkraut:
Cook onions: Heat the oil in a saucepan over medium heat. Add the thinly sliced onion and cook for 4-5 minutes, until softened and lightly golden.1 tablespoon oil + 1 medium onion
Cook sauerkraut: Add the drained sauerkraut, water, beer, or apple juice, sugar if using, caraway seeds, and pepper. Stir, cover, and cook over medium-low heat for about 10 minutes, until hot and most of the liquid has evaporated. Taste and add salt if needed.1 can sauerkraut + ⅓ cup water + 1 teaspoon sugar + ½ teaspoon caraway seeds + ½ teaspoon ground black pepper + a little salt
Assemble the sandwiches:
Assemble: Split the warm buns. Spread 1 teaspoon of sweet mustard on the bottom of each bun, then add some sauerkraut and a bratwurst. Top with more sauerkraut and another teaspoon of mustard. Serve right away.8 teaspoons sweet Bavarian mustard
Notes
Buns: Pretzel buns are lovely here, but you can use bratwurst rolls, crusty rolls, or hot dog buns.
Mustard: In the US, look for sweet Bavarian mustard or sweet German mustard. Händlmaier’s is one brand name to look for.
Sauerkraut: I use Mildessa, a mild German sauerkraut. Choose plain, mild German-style sauerkraut for a similar flavor; other styles may be more strongly seasoned and taste different in this recipe.
Internal temperature: The 160°F (71°C) temperature is the USDA safe minimum for uncooked sausage made with ground pork.