Good-Cooking - Bavarian Kraut Casserole

Ingredients

• 1/4 cup butter or margarine
• 1 cup chopped onion
• 1 1/2 pound pork tenderloin, cut into 1-inch cubes
• 1 (16 ounce) can sauerkraut
• 1/4 teaspoon nutmeg
• 1 cup sour cream