Mix eggs, sugar and vanilla sugar until thick and creamy. Sift the flour and fold into the mixture. Grease a springform pan (26 cm Ø). Fill in sponge cake mixture and smooth it down. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: not suitable/ gas: level 3) for about 25 minutes.
Remove the sponge cake, let it cool down briefly and carefully remove from the mould. Let it cool down on a cake rack. Cut the sponge in half horizontally with a long knife. Pour the mixture into a tall mixing bowl. Stir in the cream powder with the whisk of the hand mixer on the lowest setting. Then continue stirring for 3 minutes on the highest setting. Spread 3/4 of the cream evenly on the lower base. Place the upper base on top. Spread the rest of the cream all around the cake. Use a peeler to remove the chocolate shavings.
Spread 3/4 of the cream evenly on the lower base. Place the upper base on top. Spread the rest of the cream all around the cake. Use a peeler to remove the chocolate shavings. Spread the chocolate and Giotto decoratively on the cake. Decorate with mint leaves. Keep cool until serving
Whole cake without mint!!