Peel and core the apples and cut them into 1 cm cubes.
Melt the butter in a pan, add the apples, sugar, cinnamon and lemon juice and cook over medium heat, stirring now and then, for 8-10 minutes, until the apples are soft but still hold their shape and the juices have thickened. Leave to cool completely.
Preheat the oven to 200 °C. Roll out the puff pastry 3-4 mm thick and cut out 12-13 cm circles (you can cut round a small plate).
Put a heaped tablespoon of apple on one half of each circle, brush the edge of the pastry with beaten egg, fold the other half over and press the edges together with a fork.
Brush the tops with egg and score a leaf pattern with a sharp knife (only through the top layer), then prick 2-3 small steam holes.
Bake for 20-25 minutes until puffed and deep golden. Best served lukewarm.
A Receptnaptár original recipe. Calories and protein are estimated.