Sieve the flour into a bowl, add the sugar and yeast and mix well.
Then add milk, butter and egg yolk and knead everything into a smooth dough. let rise for about 1 hour.
Then roll out the dough thinly and cut into rectangles of approx. 10 x 10 cm.
Mix the mascarpone with the sugar and lemon zest until creamy.
Beat the egg white until stiff and fold into the mascarpone together with the raspberries.
Put a dollop of approx. (3 / 4- 1 tablespoon) filling on each piece of dough and moisten the edges a little. Fold into a rectangle or triangle (as you like), press down well (!!) and place on a prepared tray.
Beat the egg yolks with milk, brush the pockets with it and bake at 200 ° C for about 15 minutes until golden.
Caution: Do not use too much filling, otherwise the pockets will burst open easily!