Drain the mandarins. Cream 225 g fat, 125 g sugar and vanillin sugar. Add 4 eggs bit by bit and stir in. Mix flour, baking powder and cocoa. Stir in alternately with the milk
Spread the dough on a greased baking tray (35 x 40 cm). Spread mandarins evenly on top. Pre-bake in a hot oven (electric cooker: 200 °C/ convection oven: 175 °C / gas: level 3) for 20-25 minutes
Mix 3 eggs, 75 g sugar and sour cream until smooth. Mix 100 g sugar and grated coconut in a bowl. Cut 50 g fat into flakes
First pour the custard casting onto the cake and spread it smooth. Then sprinkle the coconut-sugar mixture over it. Spread the fat flakes on the cake. Bake the cake for another 20 minutes. Serve with whipped cream if desired