Peel, core, and cut apples into small pieces. Place in crock pot and cover with ¼ c. of sugar.
Pour approximately 1 c. apple cider over apples.
Sprinkle cinnamon, cloves, and allspice to taste (apr. ½ tsp per 1 lb of apples).
Turn crock pot on low, and allow to cook for 10-12 hours. The apple butter should be a rich, dark brown and the apples should be completely smooth. To thicken apple butter, cook for last hour uncovered.