Place puff pastry sheets next to each other on a work surface and allow to thaw at room temperature for approx. 20 minutes. In the meantime, wash the apples and cut out the core with an apple cutter.
Cut apples into slices. Roll out the puff pastry slightly larger than the pie tin (25 cm Ø). Grease the form, place the dough in it and press it down. Cut off any excess dough. Prick the bottom of the pastry several times with a fork.
Layer apple slices in the mould. Whisk sour cream, eggs, sugar and lemon peel. Pour over the apples. Bake in the preheated oven (electric cooker: 200 °C/ gas: level 3) for approx. 45 minutes.
Serve still warm with cinnamon dusting. Makes about 12 pieces.