Heat a large skillet over medium. Swirl in the oil.
Brown the bratwurst on all sides, 6–8 minutes. Transfer to a plate.
Soften the onions in the skillet until golden at edges, about 5 minutes.
Stir in garlic for 30 seconds. Pour in half the beer, scraping up browned bits.
Add sauerkraut, caraway, vinegar, brown sugar, and pepper. Nestle sausages back in.
Pour in remaining beer to come about halfway up. Cover and simmer 12–15 minutes.
Uncover and reduce liquid 3–5 minutes. Stir in butter, then season with salt to taste.
Notes
Variation: Swap half the beer with low-sodium chicken broth for a lighter flavor, or add sliced apples for a touch of sweetness.Serving tip: Pile the sausages and kraut into warm pretzel rolls with hot mustard. Leftovers keep 3 days; reheat gently with a splash of beer.This recipe is an original creation inspired by classic Easy Authentic German Bratwurst Recipes flavors. All ingredient ratios and instructions are independently developed.