1. Core apples, leaving bottoms intact and using a paring knife to enlarge holes. Peel skin from around top of apples. Place apples in single layer in oval slow cooker bowl (if you have a round slow cooker, you can cook only 5 apples).
2. Stir together sugar, walnuts, raisins, cranberries, zest, cinnamon and nutmeg. Place 1 1/2 tablespoons raisin mixture in each apple; divide butter and place on top of apple filling. Pour orange juice and 1/4 cup water over top of apples. Cover and cook on HIGH for about 3 hours.
3. Place apples in individual bowls and spoon remaining sauce over top.