For the dough, mix all the ingredients in a bowl.
Transfer the dough to a work surface and knead until you have a smooth and elastic dough.
Shape the dough into a ball, brush the surface with oil, place the bowl over the dough and leave to rest at room temperature for about 30 minutes.
Melt the butter and leave to cool.
Lightly toast the breadcrumbs and ground nuts in a pan, leave to cool and mix with the sugar and cinnamon.
Wash the apples and cut into thin slices.
Preheat the oven to 180 degrees.
Dust a large cloth or tablecloth with flour.
Place the dough on the cloth and carefully pull it into a large rectangle with your hands. The dough should be so thin that you could read a newspaper through it.
Cut off the thicker edges.
Carefully brush the dough with the melted butter, sprinkle with the breadcrumb and nut mixture and top with apple slices and raisins.
Fold the strudel dough over the filling by about three centimeters on all sides.
Lift one side of the cloth so that the strudel rolls up loosely.
Place the strudel on a greased baking tray, brush with the remaining butter and bake for 45 minutes until golden brown.
Serve with powdered sugar and vanilla sauce or vanilla ice cream while still warm. Bon appétit!