Adapted from thekitchn.com
½ large red onion
1 lb. sauerkraut
14-oz. kielbasa, sliced into 1/2” rounds
1 T. butter
1 T. vegetable oil
2 T. packed dark brown sugar
1 T. spicy brown mustard
Freshly ground black pepper
Chopped scallions, for garnish
Thinly slice 1/2 large red onion (use a mandoline, if possible). Drain 1-pound sauerkraut.
Heat butter and oil in a large skillet over medium heat until the butter is melted and the oil is shimmering. Add the kielbasa in an even layer. Cook until browned on the bottom, about 3 minutes. Flip and cook until browned on the second side, about 3 minutes more. Transfer to a bowl or plate using tongs or a slotted spoon, leaving the fat in the skillet.
Cook, stirring constantly, until the sauerkraut is heated through and onion is softened, 5 to 8 minutes. Taste and season with freshly ground black pepper as needed.Return the kielbasa to the skillet and toss to combine. Garnish with chopped scallions.
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