Leave the strudel dough in its packaging to rest for approx. 10 minutes at room temperature. (If you have frozen it in between, the edges will break!) Meanwhile, melt butter. Chop the walnuts. Peel, wash and quarter apples, remove core. Cut the fruit flesh first into columns, then into small pieces. Mix with lemon juice, cranberries, walnuts and breadcrumbs.
Moisten a tea towel and spread it out, place a dry one on top. Unfold the strudel leaves and place them slightly flaky on the towels, each turned at 90°C. Spread each sheet with melted butter. Spread the apple mixture on the lower half of the dough, leaving 3 cm of edge free. Whip the ends of the dough at the sides. Wrap the strudel into a roll using the cloths. Place on a baking tray lined with baking paper. Coat again with melted butter. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for about 30 minutes.
Wrap the strudel into a roll using the cloths. Place on a baking tray lined with baking paper. Coat again with melted butter. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for about 30 minutes. Dust with icing sugar while still hot and thick. Delicious with vanilla ice cream