Cream fat and 100 g sugar. Stir in the eggs one by one. Mix flour and baking powder, stir in. Spread the dough into a greased springform pan (approx. 26 cm Ø). Bake in the preheated oven (electric cooker: 200 °C / convection oven: 175 °C/ gas: level 3) for 15-20 minutes. Let them cool down
Wash the plums and stone them (drain the glass fruit). Quarter plums. Cut 12 quarters into slices, put aside for decoration. Whip cream and 4 tbsp. firming agent until stiff. Mix quark, 4 tablespoons sugar, juice and the rest of the firming agent. Fold in cream, up to about a quarter for decoration.
Place the mould edge around the base. Spread plums on top. Pour in the curd mixture and smooth it down. Chill the cake for 2-3 hours
Remove the cake from the mould. Spray the remaining cream onto the cake as spots. Decorate with plum wedges and chopped pistachios