Peel and quarter the apples and remove the core. Cut apples into pieces and put them into a pot together with 25 g sugar and 200 ml water and bring to the boil. Simmer at low heat for about 8 minutes. Mix starch and 2 tablespoons of water and thicken the apple compote with it. Bring to the boil again and stir in 5 tablespoons of advocaat. Let it cool down.
Put quark, remaining sugar, vanillin sugar, salt, 5 tablespoons milk and oil into a mixing bowl and mix with the whisks of the hand mixer. Mix flour and baking powder and stir into the quark mixture in portions. Finally, work into a smooth dough with your hands. Roll out the dough on a lightly floured work surface to a thickness of 3-4 mm and cut out approx. 10 squares (each 12 x 12 cm). Separate the egg. Brush the edges of the dough with egg white. Place a tablespoon of apple compote in the middle of each dough and fold the dough into a triangle. Press the edges firmly together and, if necessary, wheel along the edge with a dough wheel. Bake in the preheated oven (electric cooker: 200 °C/ gas: level 3) for about 15 minutes. Mix the egg yolks and 1 tablespoon of milk and brush the apple pockets with it 10 minutes before the end of the baking time. Let them cool down on a cake rack. Mix icing sugar, remaining egg liqueur and remaining milk.
Press the edges firmly together and, if necessary, wheel along the edge with a dough wheel. Bake in the preheated oven (electric cooker: 200 °C/ gas: level 3) for about 15 minutes. Mix the egg yolks and 1 tablespoon of milk and brush the apple pockets with it 10 minutes before the end of the baking time. Let them cool down on a cake rack. Mix icing sugar, remaining egg liqueur and remaining milk. Pour into the freezer bag and cut off a small corner. Decorate apple pockets with it and let them dry. Results in about 10 pieces