Defrost the puff pastry side by side on the foil (lying between the slices). Bring 200 ml nectar, lemon juice and sugar to the boil. Add frozen fruit and bring to the boil. Stir starch with 5 tablespoons of nectar until smooth and bind the groats with it. Bring to the boil again briefly and let it cool down. Remove the foil from the puff pastry. Place 1 tablespoon of cold groats in the middle of each slice.
Brush the edges of the dough with a little water and fold the dough diagonally into a triangle. Press the edges of the dough firmly with a fork. Cut triangles on the top and place them on two baking trays lined with baking paper. Whisk the egg yolk and cream, spread a thin layer of the mixture on the packages and bake them one after the other in a preheated oven (electric range: 200 °C/ convection oven: 175 °C/ gas: level 3) for 15-20 minutes until golden brown. Remove. Serve the berry pack lukewarm or cold with the rest of the berry groats
30 minutes waiting time