Sauerkraut & Sausage Casserole
INGREDIENTS4 teaspoons extra-virgin olive oil, divided1 large onion, sliced1 1/2 teaspoons caraway or fennel seeds1 large sweet-tart apple, such as Braeburn, chopped1 cup dry white wine10 ounces turkey kielbasa, cut into 1/2-inch slices2 1/2 cups drained sauerkraut, rinsed3 tablespoons cider vinegar1 tablespoon spicy brown mustard1/4 teaspoon freshly ground pepper2 large Yukon Gold potatoes (about 1…