In a medium-sized mixing bowl, mix together sugar, flour, baking powder, baking soda, and salt.
Add in the butter, and mix until well-combined. You should end up with a fine crumb texture.
Mix in mayonnaise until well-combined.
Mix in lemon juice until well-combined.
Fold in raisins, walnuts, and apples.
Fill cupcake liners ¾ full.
Bake for 25 minutes or until a toothpick comes out dry.
Remove cupcakes from tins and set on a cooling rack to cool.
Once cool, top cupcakes with whipped cream and garnish with half of a grape.
Notes
If you like the look of cupcake liners, use silicone or grease-proof liners. The moisture of the apples will cause the cupcakes to pull away from standard paper liners.