Roll out the puff pastry and cut into 6 equal squares and brush the edges with egg yolk. Stir the marzipan with about 50 ml milk until smooth. Add the rest of the milk and the pudding cream powder and beat until thick.
Dump the mandarins.
Place a tablespoon of the pudding cream on a puff pastry square and cover with some mandarin fillets. Place all the ends of the pastry on top of the mandarins and press them down slightly. Place on a baking tray.
Whisk the remaining egg yolk with a little milk and brush the puff pastry pockets with it. Sprinkle with sugar crystals.
Bake the bags in a preheated oven at 180C° for about 25 minutes. Let the puff pastry pockets cool down a bit, place them on a plate and garnish with 2 - 3 tablespoons of red fruit jelly and cream patties.