Defrost puff pastry slices side by side at room temperature. Line a baking tray with baking paper. Preheat oven (electric cooker: 200 °C/circulating air: 175 °C/gas: see manufacturer). 1⁄2 Sprinkle tablespoons of sugar onto the work surface.
Place 1 slice of dough on top, sprinkle with 1⁄2 tbsp. sugar, place 2nd slice on top and sprinkle with 1 tbsp. sugar. Roll out with a dough roll about twice as big. Place on the baking tray and bake in a hot oven for about 15 minutes.
Take out, let it cool down.
Mix cream quark, 150 g sugar and vanilla sugar. Whip cream until stiff and fold in. Break the puff pastry into pieces. Layer quark cream, plum spread and puff pastry alternately in a large bowl.
Keep cool until serving.