Mix the apples and lemon juice with all the other ingredients up to and including the breadcrumbs.
Unfold 4 pastry sheets, place the sheets next to each other on the work surface, overlapping by approx. 5 cm. Brush the pastry sheets with butter. Lay the remaining sheets of pastry on top, brush with butter. Spread the filling on top, leaving approx. 5 cm free at the ends. Fold in the ends, roll up into a long strudel, twist to create a spiral, place on a baking tray lined with baking paper. Brush the strudel with the remainder of the butter, sprinkle with the sugar and nuts.
Approx. 35 mins. in the centre of an oven preheated to 200°C. Remove and allow to cool slightly. Dust the strudel with icing sugar, serve lukewarm.