01 -
Cook diced apples with granulated sugar, cinnamon, flour, lemon juice, and butter in a skillet over medium heat until the apples soften and the mixture thickens, about 8 minutes.
02 -
Transfer the filling to a bowl and allow it to cool completely before assembling.
03 -
Roll out the thawed puff pastry sheets and cut each sheet into equal squares, approximately 12 cm per side.
04 -
Place a spoonful of the cooled apple filling in the center of each square; fold the pastry diagonally to form triangles.
05 -
Press the edges firmly with a fork to seal completely and prevent filling leakage.
06 -
Brush each turnover with the beaten egg wash and sprinkle generously with coarse sugar.
07 -
Arrange turnovers on a parchment-lined baking sheet and bake in a preheated oven at 200°C for 18 to 22 minutes until golden brown and puffed.
08 -
Mix powdered sugar, milk, and vanilla extract to create a glaze; drizzle over cooled turnovers as desired.