Wash the plums, dab dry, halve, stone and cut into slices. Dice butter. Mix the flour, 100 g sugar, salt, vanillin sugar, egg yolk and butter in a bowl, first with the dough hooks of the hand mixer, then with your hands to form crumbles. Mix ricotta, 2 tablespoons sugar, egg, pudding powder and milk. Grease 6 Tartelettes with lift-off base (approx. 10 cm Ø) and dust with flour. Spread about 2/3 of the crumbled dough into the moulds. Press down to smooth bottom, pulling up at the edges.
Place the plum wedges in a star shape on the crumble base and pour the ricotta mixture over them. Knead remaining crumbles with brittle and spread on the tartlets. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 2) for 20-25 minutes. Finally cover with foil if necessary. Remove the tartelettes and let them cool down on a cake rack. Remove the tartelettes from the ramekins and arrange them
Waiting time approx. 1 hour