For the base, mix icing sugar, fat, flour and egg yolk with a hand mixer. Work quickly with your hands to a smooth dough. Wrap in foil and chill for about 30 minutes.
In the meantime, wash the plums, cut them in half, remove the seeds and cut them into slices. Roll out the short pastry on a lightly floured work surface until round (approx. 5mm thick). Line a greased springform pan (26 cm Ø) with it.
Pull the edge up 3 cm. Put any leftover dough aside. Prick the base several times with a fork. Line with baking paper and fill with dried peas. Bake in the preheated oven (electric cooker: 200 °C/ gas: level 3) for about 30 minutes.
Then take out the baking paper and peas and let them cool down. Form dough remains into leaves and bake for about 8 minutes. For the filling, soak gelatine in plenty of cold water. Mix yoghurt, lemon juice and zest, sugar, cinnamon and vanilla pulp.
Squeeze gelatine vigorously, dissolve lukewarm and stir into the yoghurt. Cool until the mixture begins to set. Whip the cream until stiff. Fold 3/4 of the plums and the cream into the yoghurt.
Cover the short pastry firmly with a springform pan rim. Pour in yoghurt cream. Press in the remaining plum wedges. Put it in a cold place. Sprinkle with cinnamon and sugar crystals before serving. Decorate with short pastry leaves.
Results in about 12 pieces.