II
The Method
1
Combine the flour, warm water, oil, and salt in a bowl. Turn onto a work surface and knead vigorously for 10 minutes — the dough must be worked hard to develop its gluten fully. Form into a smooth ball, brush the surface lightly with oil, cover with an inverted warm bowl, and rest for 30 minutes. The dough is ready when it yields to gentle pressure with complete pliability and no spring-back resistance.
2
While the dough rests, combine the sliced apples, raisins, caster sugar, cinnamon, and Calvados in a bowl. Stir to coat evenly and set aside. Melt 60 g of butter in a frying pan over medium heat and toast the breadcrumbs, stirring constantly, until they are an even golden brown and smell of toasted grain. Remove from the heat immediately.
3
Preheat the oven to 200 °C. Spread a clean, lightly floured cloth across a large table. Place the rested dough at the centre. Insert both hands beneath the dough, palms down, and stretch outward from the centre using the backs of the hands and a gentle knuckle motion — never the fingertips. Work gradually around the dough, stretching in all directions, until the sheet is thin enough to read print through; it should measure roughly 60 × 80 cm with no opaque patches. This is the step on which the dish lives or dies: a non-rested dough tears immediately, and tears cannot be repaired without thickening the pastry.
4
Brush the entire stretched sheet generously with melted butter. Scatter the toasted breadcrumbs evenly across three-quarters of the surface, leaving a 5 cm border along the far long edge. Spread the apple filling in an even layer over the breadcrumbs. The breadcrumb layer must fully cover the area beneath the filling: it is the sole barrier between the apple juices and the pastry during baking.
5
Using the cloth as a lever — not the hands directly — lift the near edge and roll the strudel away from you in a tight, even cylinder. Seal the ends by tucking them under. Transfer the roll, seam side down, to a buttered baking tray. Brush the exterior thoroughly with melted butter. The roll should be compact and even, with no visible tears in the outer surface.
6
Bake at 200 °C for 35–40 minutes, brushing once more with melted butter at the midpoint. The strudel is done when the pastry is a deep, uniform amber and shatters at the lightest tap — it should sound hollow and crisp, not dull.
7
For the Vanillesauce, warm the milk, cream, and vanilla pod with its seeds to just below simmering. Whisk the egg yolks and sugar to a pale ribbon. Pour the hot liquid over the yolks in a thin stream, stirring, then return to the pan and cook over low heat, stirring constantly, until the sauce coats the back of a spoon. Strain and keep warm. The sauce is a thin crème anglaise — it should pour freely, not hold a trail.
8
Dust the baked strudel with icing sugar. Slice at the table and serve immediately with warm Vanillesauce poured around each portion. The canonical service presents the contrast of shatteringly crisp, hot pastry against the cold or tepid poured sauce.