Defrost puff pastry at room temperature. Roll out on a floured work surface with a cake roll approx. 1 1/2 times as long. Cut out 4 circles (approx. 9 cm Ø) with a round cookie cutter. From the remaining puff pastry (only 16 corners remain) cut out or cut out 16 circle quarters. Place the circles and quarters on a baking tray lined with baking paper. Prick several times with a fork. Whisk the egg yolks and milk.
Spread the puff pastry with it. Sprinkle quarters with sugar. Bake in the preheated oven (electric range: 200 °C/ convection oven: 175 °C/ gas: level 3) for 10-12 minutes. Remove from the oven and put in a cool place. Whip the cream with the whisks of the hand mixer until stiff, sprinkling vanilla sugar. Spread circles with 2 teaspoons of plum puree each. Spread the cream on top and cover with puff pastry quarters like a windmill
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