Drain the plums well, collecting the juice. Put 6 plum halves aside. Cut the remaining plums into small slices and turn them over in 1 tablespoon of flour. Separate the eggs. Cream butter, 100 g sugar and lemon peel. Stir in the egg yolks one by one, add rum flavour.
Mix 125 g flour and baking powder. Alternately stir in the milk. Fold in plum pieces. Pour into a greased springform pan (26 cm Ø) and bake in a preheated oven (electric range: 175 °C/ convection oven: 150 °C/ gas: level 2) for about 15 minutes. In the meantime beat egg white and salt until stiff. While continuing to beat, add 150 g sugar. Continue beating until the sugar is completely dissolved. Spread on the pre-baked dough. Leave an approx. 2 cm large rim. Bake for 15-20 minutes. Remove from the tin and allow to cool completely. Soak the gelatine in 150 ml prune juice.
Continue beating until the sugar is completely dissolved. Spread on the pre-baked dough. Leave an approx. 2 cm large rim. Bake for 15-20 minutes. Remove from the tin and allow to cool completely. Soak the gelatine in 150 ml prune juice. For the cream, mix mascarpone, quark, 75 g sugar, lemon juice and vanilla flavouring with the whisk of the hand mixer. Whip the cream until stiff, fold in and spread on the meringue. Cut retained plums into slices and spread on the cake. Heat the soaked gelatine lukewarm, let it draw a little and drizzle it onto the cake. Decorate with vanilla croissants. Serve dusted with icing sugar
For the cream, mix mascarpone, quark, 75 g sugar, lemon juice and vanilla flavouring with the whisk of the hand mixer. Whip the cream until stiff, fold in and spread on the meringue. Cut retained plums into slices and spread on the cake. Heat the soaked gelatine lukewarm, let it draw a little and drizzle it onto the cake. Decorate with vanilla croissants. Serve dusted with icing sugar
Waiting time approx. 70 minutes