Make the dough
In a large bowl, stir together all-purpose flour and fine salt. Add lukewarm water, neutral oil, and white vinegar, then mix until a shaggy dough forms. Turn it onto a lightly floured counter and knead for about 8 minutes, until smooth, soft, and elastic.
Rest the dough
Shape the dough into a ball, place it in a bowl, and cover it so the surface does not dry out. Let it rest for 30 minutes so the gluten relaxes and the dough stretches without springing back.
Prep the filling
Stir the raisins with the dark rum in a small bowl and let them soak for 10 minutes. While they plump up, peel, core, and thinly slice the tart apples. Toss the apples with granulated sugar, ground cinnamon, lemon zest, and lemon juice, then fold in the drained raisins.
Toast the crumbs
Set a skillet over medium heat and melt the 70 g of unsalted butter. Add the fine dry breadcrumbs and stir constantly until they turn golden and smell nutty, about 4 minutes. Take the pan off the heat right away so they do not burn.
Heat the oven
Preheat the oven to 375° F and line a baking sheet with parchment.
Roll the strudel
Lightly dust your work surface with flour, then roll the dough into a very thin rectangle. Slip your hands under it and gently stretch it from the center outward until it is almost see-through. Brush the dough with some of the melted butter, scatter the toasted breadcrumbs over it, leaving a narrow border, and spoon the apple filling in a long mound along one long side. Fold the short ends in, roll it up tightly into a log, and set it seam-side down on the prepared baking sheet.
Bake until golden
Brush the top with the remaining melted butter. Bake for 35 to 40 minutes, until the crust is deep golden brown and crisp and the filling is bubbling at the seams. If it starts browning too quickly, tent it loosely with foil for the last few minutes.
Cool briefly
Let the strudel cool for 15 minutes so the filling settles and slices cleanly.
Dust and slice
Dust with 2 tbsp powdered sugar, then cut the strudel into thick slices and serve warm.


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