Ingredients
4 tablespoons unsalted butter
2 medium onions, thinly sliced
3 pounds green cabbage (about 1 head), cored and thinly sliced
1 large, tart green apple, such as ‘Granny Smith,’ peeled, cored, and chopped
1 cup apple cider
1/3 cup cider vinegar
2 tablespoons packed light-brown sugar
1 tablespoon coarse salt
1 teaspoon freshly ground pepper
9 knockwurst (about 2 pounds)
Whole-grain mustard, for serving
Preparation
Melt butter in a large heavy-bottomed pot over medium-low heat. Add onions; cook, stirring occasionally, until very soft and golden brown, about 18 minutes.
Stir in cabbage, apple, cider, vinegar, sugar, salt, and pepper. Cover; cook, stirring occasionally, until cabbage is very soft, about 1 hour.
Tuck sausages into cabbage; cover pot. Cook until heated through, about 20 minutes. Serve with mustard.