In the bottom of a Crock Pot, spread out half of the sauerkraut. Avoid letting the liquid drain into the pot. Then, sprinkle half the seasonings over the sauerkraut (salt, pepper, caraway, celery seed, mustard, paprika).
Slice the sausage and arrange it on top of the sauerkraut. Spread the remaining sauerkraut over the sausage and distribute the remaining seasonings over the top. Finally, drizzle in the apple cider vinegar. Do not stir the ingredients!
Cover the Crock Pot and cook the ingredients on high heat for at least 4 hours. Before serving, thoroughly stir the sauerkraut and sausage together. Voila!