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© Meredith Corporation. All rights reserved. Used with permission.
Preheat oven to 400°F.
Heat 2 teaspoons oil in a large skillet over medium heat. Add onion and cook, stirring, until beginning to brown, about 5 minutes. Stir in caraway (or fennel) seeds and cook until fragrant, about 30 seconds. Add apple and wine; increase heat to medium-high and cook, stirring, until most of the wine has evaporated, about 5 minutes. Stir in sausage, sauerkraut, vinegar, mustard and pepper. Transfer to a 9-by-13-inch (or similar 3-quart) baking dish.
Toss potato slices with the remaining 2 teaspoons oil, butter and salt in a bowl until coated. Cover the sauerkraut mixture with tightly overlapping potato slices.
Bake the casserole until the potato edges start to get crispy, 50 minutes to 1 hour. Cool for 10 minutes before serving.