Place the apples, banana and raisins in a 3-qt. slow cooker coated with cooking spray. In a small bowl, combine the orange juice, brown sugar, honey, butter and pie spice; pour over apple mixture. Cut ends off lemon. Cut into six wedges and remove seeds. Transfer to slow cooker. Cover and cook on high for 3-4 hours or until apples are soft.
Discard lemon. Mash apple mixture. In a small bowl, combine oatmeal and water. Let stand for 1 minute. Stir into applesauce.