Mix the flour with the water, oil and salt on a work surface and knead until the dough is smooth and homogeneous.
Form it into a ball, cover with plastic wrap, and let rest for at least 30 minutes.Meanwhile, prepare the filling for the strudel. Peel and slice the apples.
Soak the raisins in a bowl of lukewarm water for 15 minutes; then drain the raisins and press to remove excess water.Melt the butter In a large skillet.
Add the apple slices, raisins, pine nuts, and a pinch cinnamon. Stir in enough breadcrumbs to reach your desired filling consistency.Heat the oven to 350°F (180°C) and line a baking sheet with parchment.
With the back of your hands, stretch the dough into a thin sheet on a lightly floured work surface.
Spoon the filling along the long side of the pastry, leaving a 2 inches (few cm) border and roll it up, making sure it is well sealed by pressing down along the edges with your fingers and curling up the two ends.In a small bowl, lightly beat the egg with a fork.
Brush the strudel with the egg. Set it on the prepared baking sheet and bake for about 20 minutes. A few minutes before it is done, dust with powdered sugar and finish baking. Serve with whipped cream, if you like.