Place puff pastry slices next to each other and defrost at room temperature. Wash and drain the raisins. Coarsely chop the almonds. Peel, quarter and core apples, cut into pieces.
Mix apples with raisins, almonds and lemon juice. Put the puff pastry slices back on top of each other. Roll out into a rectangle (approx. 36 x 45 cm) on a lightly floured work surface. Whisk the egg and brush the edges of the pastry rectangle with it.
Sprinkle breadcrumbs on the dough plate. Spread the apple mixture on top, leaving a margin of approx. 3 cm on each side (except on a short side). Mix sugar and cinnamon and sprinkle on the apples.
Beat the edges of the dough over the apples on the long sides. From the short side roll up to a strudel. Place the roll with the seam facing down on a baking tray lined with baking paper. Brush with the remaining egg.
Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for approx. 30 minutes. Serve hot or cold with vanilla sauce. Dust with icing sugar.