Put flour, 75 g sugar, vanillin sugar, salt, almonds, egg yolk and butter in a bowl. Mix with the dough hooks of the hand mixer. Then work into crumbles with your hands. Line the bottom of a springform pan (26 cm Ø) with baking paper. Place the crumbles on top and press them evenly with your hands to form a base. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for 20-25 minutes on the bottom shelf. Remove from the oven and let cool on a cake rack.
Wash and clean the strawberries and drain them well. Remove the base from the tin and remove the baking paper. Put the base back into the baking tin and surround it with the rim of the springform pan.
Mix quark, sour cream, cream and 75 g sugar with the whisks of the hand mixer. Add sauce powder, stir in briefly and whip at highest setting for approx. 1 minute. Pour the cream onto the base of the springform pan and smooth it down. Place the strawberries with the tip facing upwards. Chill for about 2 hours.
Finely crumble the Amaretti. Coarsely chop the chocolate coating. Remove the cake from the edge of the springform pan with a knife. Press the amaretti crumbs to the edge. Melt the couverture over a warm water bath, fill into a freezer bag, cut off a small corner. Decorate the cake in strips with the chocolate coating. Let it dry. Arrange on a plate. Carefully cut into pieces