Make 3 cake layers of this delicious vanilla buttermilk sponge cake recipe.
Mix the mascarpone, heavy cream and powdered sugar with an electric mixer until smooth.
Cut out the bump on the cake layers, fill the first layer with the mascarpone frosting, and fruit slices and close with the second cake layer, repeat again the last step to finish with the last cake layer.
Cover the entire cake with a thin layer of frosting and smooth quickly to give it a semi-naked cake effect.
Decorate with fresh berries and place in the fridge for 1 hour before serving and enjoying.