Knead butter in pieces, 40 g icing sugar, flour, cocoa, egg yolk and 1 pinch of salt first with the dough hooks of the hand mixer, then with floured hands to a smooth dough. Knead the chocolate shavings into the dough. Wrap the dough in foil and chill for approx. 30 minutes
In the meantime, mix mascarpone, low-fat curd, 125 g sugar, 1 pinch of salt and lemon peel. Stir in the eggs one by one. Finally, stir in 3 tablespoons of starch
Roll out the dough between 2 layers of baking parchment round (approx. 28 cm Ø). Place in a greased springform pan (20 cm Ø), carefully pressing down the rim. Pour in the cheese mixture. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for approx. 1 hour on the lower shelf, remove from oven, and let cool in the mould on a cake rack for approx. 3 hours
For the compote, bring nectar, 1 tablespoon sugar and vanillin sugar to the boil in a pot. Mix 1-2 tsp. starch with 1 tbsp. water, pour into the juice while stirring, simmer for 1-2 minutes, remove from the heat. Stir in berries, let cool down for about 10 minutes. Remove the cake from the tin, place the compote on top and dust with icing sugar on the edges. Cream marbled with berries tastes good with it
waiting time approx. 3 1/2 hours