Combine all dry ingredients and generously rub over surface of ribs. Refrigerate for 4 hours or overnight.
Preheat oven to 250 degrees. Place room temperature ribs on high edged baking sheet lined with wire rack set upon mason jar rings. Pour 1 cup apple cider in baking sheet, place ribs on the rack and cook for 1 ½ hours. Add another 1 cup cider and cook for another 1 ½ hours or until meat pulls apart from bones.