Place the puff pastry slices next to each other and defrost. Grind the pistachios. Mix breadcrumbs, pistachios and cinnamon. Boil 40 g sugar and 100 ml water for 5 minutes. Separate the egg. Take the syrup from the stove, let it cool down a little.
Stir in breadcrumbs and egg yolk. Roll out puff pastry sheets on a floured work surface and cut out 12 circles (6 cm Ø). Spread the pistachio mixture as a blob in the middle of the circles.
Coat the edge with egg white, fold over and press the edge firmly with a fork. Place the pistachio pockets on a baking tray lined with baking paper. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for 20-25 minutes.
Remove the bags and let them cool down. Bring 100 g sugar, butter, honey and 100 ml water to the boil and simmer for 5 minutes. Spread half of the pockets with the syrup and let it soak in. Sprinkle with icing sugar and ground pistachios.
Add the remaining syrup.