Berry Pastry Squares
Thaw the puff pastry and separate. Brush the pastry with a little water stack the layers. Roll out into a rectangle about 25 x 40 cm (approximately 10 x 16 inches). At the edges, cut off two strips about 2 1/2 cm (approximately 1 inch) from each long side. Brush the edge of the dough with an egg yolk and place the strip of dough on the dough. Lay on a sheet tray and prick the dough with a fork several times. Line the dough with parchment paper and fill with the dried beans. Bake in a preheated oven at 225°C (approximately 440°F) for about 20-25 minutes. Remove the parchment and the beans and let cool.
Rinse the berries and pat dry. Spread over the pastry with the pistachios.
To serve, cut into pieces.