For the kiwi mascarpone cake for the sponge cake base, separate the eggs and beat the egg whites until stiff. Add the sugar to the yolks and beat until foamy.
Then add flour, cornstarch and baking powder, then fold in the snow.Pour the batter into a cake tin and then bake in the oven at about 180 ° C for about 15-20 minutes.
For the filling, put the mascarpone, sugar, vanilla sugar and the zest of a lemon in a bowl and pour the whipped cream over it. Beat everything for about 2-3 minutes until stiff. Divide the mixture and add the chopped kiwi fruit to one half. Save a few pieces for the decoration.
Cut the cooled cake in half, fill with the mascarpone mixture (kiwis) and cover and decorate the cake with the other mascarpone mixture.