For easy clean-up, place a cooking bag in your slow cooker.
Place pork loin in crock pot. Sprinkle with caraway seeds and black pepper.
Place applesauce on top of pork.
Pour sauerkraut juice around the sides of the pork. Place the sauerkraut on top of the meat.
Evenly sprinkle the brown sugar on top of the sauerkraut.
Drizzle the top with melted butter.
Cook on low for about 6 hours or until pork reaches internal temp of at least 160°F.
To serve, slice pork and stir sauerkraut to blend all juices.