Pour cream into a bowl. Wash the cream cup and dry it. Add eggs to the cream. Mix flour and baking powder and sieve. Add 1 cup of sugar, vanillin sugar and flavour, mix and add to the egg cream. Mix with the whisks of the hand mixer.
Grease a baking tray (32 x 39 cm), spread the dough on it until smooth. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for about 10 minutes. Put butter, 1/2 cup of sugar, almonds and hazelnuts into a small pot, bring to the boil while stirring and let cool down a bit. Dice 2/3 of the papaya and mango and stir in. Stir in half of the pistachios. Spread the mixture on the pre-baked base and put back into the oven. Bake for another 10 minutes at the same temperature. Remove from the oven, place on a cake rack and let it cool down. Chop the chocolate coating into small pieces and melt on a hot water bath. Finely chop the rest of the papaya, mango and pistachios. Sprinkle over the cake. Pour the chocolate coating into a freezer bag and cut off a small corner.
Bake for another 10 minutes at the same temperature. Remove from the oven, place on a cake rack and let it cool down. Chop the chocolate coating into small pieces and melt on a hot water bath. Finely chop the rest of the papaya, mango and pistachios. Sprinkle over the cake. Pour the chocolate coating into a freezer bag and cut off a small corner. Cut the cake into 24 pieces and decorate with fine chocolate door strips. Leave to dry