Cut butter into pieces. Put 3 tablespoons of sugar, butter, flour, egg yolk and salt in a bowl and knead to a smooth dough. Wrap the dough in foil and chill for about 30 minutes. Put mandarin oranges on a sieve and collect the juice. Beat the egg, 2 tbsp.
sugar and vanilla sugar until creamy with the whisks of the hand mixer. Add quark, crème fraîche, pudding powder and 2-3 tbsp. mandarin orange juice and stir until smooth. Grease tartlet moulds (10 cm Ø) with lift-off base. Divide the dough into 4 equally sized pieces and roll out into circles (approx. 14 cm Ø) on a floured work surface. Place the dough in the greased moulds, press the edges slightly and prick the bases several times with a fork. Fold the mandarins into the quark mixture. Spread the quark mixture over the ramekins. Bake in the preheated oven (electric range: 175 °C/ convection oven: 150 °C/ gas: level 2) bottom shelf for 35-40 minutes. Remove the tartlets, let them cool down a little and remove them from the tartlets.
Place the dough in the greased moulds, press the edges slightly and prick the bases several times with a fork. Fold the mandarins into the quark mixture. Spread the quark mixture over the ramekins. Bake in the preheated oven (electric range: 175 °C/ convection oven: 150 °C/ gas: level 2) bottom shelf for 35-40 minutes. Remove the tartlets, let them cool down a little and remove them from the tartlets. Let them cool down on a cake rack. Dust with icing sugar
Waiting time approx. 1 hour