Defrost the puff pastry. Place slices on top of each other and roll out to a rectangle (25 x 30 cm) on a floured surface. Fold the long sides approx. 4 cm towards the middle. Cut the edges several times crosswise. Prick the middle several times
Place on a baking tray lined with baking paper. Bake the strips in a hot oven (electric cooker: 200 °C / convection oven: 175 °C/ gas: level 3) for approx. 15 minutes. Whisk egg yolk and cream. Brush the edges of the dough with it. Bake for another 10 minutes. Let cool off
Clean, wash, stone and possibly quarter plums. Boil up with 20 g sugar and vanillin sugar. Simmer for 5-7 minutes while stirring. Let the compote cool down
Mix mascarpone, quark, 30 g sugar, cinnamon and juice. Fill into the middle of the strip, spread compote on top. Sprinkle with pistachios