1. Place potatoes in slow cooker. Mix sauerkraut, apple and chopped onions in large bowl; spoon half over potatoes.
2. Top with pork, kielbasa and remaining sauerkraut mixture. Mix apple juice, brown sugar and remaining seasonings in small bowl. Lightly stir mixture into sauerkraut. Cover.
3. Cook 8 hours on LOW or 4 hours on HIGH until meat and vegetables are tender.
Slow Cooker Tip: For best results, do not remove cover during cooking.