Chop the pistachios. Cream 250 g butter, sugar, salt and vanilla sugar with the whisk of the hand mixer. Stir in the eggs one after the other. Mix flour and baking powder and stir in alternately with the milk.
Stir in pistachios, almonds and lemon juice. Pour the mixture into a greased, flour-dusted grease pan of the oven (34 x 38 cm) and bake in a preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see
manufacturer) bake for about 35 minutes. Remove and let cool on a cake rack.
Cut the mango off the stone. Peel and slice the flesh. Mix 100 g butter and icing sugar until creamy. Add cream cheese and whip mixture. Spread the cream on the cake, cover with mango slices and chill for about 30 minutes.
Chop the chocolate finely and melt it over a warm water bath. Spoon the chocolate into strips with a spoon and allow to set for about 10 minutes. Cut the cake into strips, place on plates and cut into pieces.