Strudel di mele (Apfelstrudel) is the defining dessert of Trentino-Alto Adige—a paper-thin hand-stretched pastry wrapped around a filling of sliced apples, raisins, pine nuts, cinnamon, and butter-toasted breadcrumbs, baked until the layers of pastry are shatteringly crisp and golden while the apple filling inside is soft, fragrant, and barely holding together. This is the Italian expression of the Austro-Hungarian Apfelstrudel, and in the Dolomites and South Tyrol it is served at every meal from afternoon merenda to post-dinner dessert, in every rifugio, Gasthaus, and family kitchen. The pastry is the critical element: a simple dough of flour, water, oil, and a small amount of vinegar (which develops the gluten while keeping it extensible) is kneaded until very elastic, then rested for at least 30 minutes before being stretched by hand over a floured cloth—pulled gently from the centre outward until it is translucent enough to read a newspaper through. This hand-stretching technique (not rolling—stretching) produces the characteristic multi-layered, shatteringly crisp texture that distinguishes proper strudel from its puff-pastry or phyllo imitations. The filling uses the local apples of the Trentino-Alto Adige valleys—Renetta (Reinette), Golden Delicious, or other varieties that are tart and firm—peeled, cored, sliced thin, and tossed with sugar, cinnamon, raisins (soaked in rum or grappa), pine nuts, and breadcrumbs that have been toasted golden in butter (the breadcrumbs absorb excess juice, preventing the pastry from becoming soggy). The filling is mounded along one edge of the stretched dough, which is then rolled using the cloth as an aid, transferred to a baking sheet, brushed with melted butter, and baked at 180°C until the pastry is deeply golden and crisp.
Hand-stretched dough (flour, water, oil, vinegar). Stretch until translucent. Filling: sliced apples, raisins, pine nuts, cinnamon, butter-toasted breadcrumbs. Roll using a cloth. Brush with melted butter. Bake until shatteringly crisp. Serve warm with powdered sugar.
The vinegar in the dough relaxes the gluten, making stretching easier. Work on a large, lightly floured cloth (a clean tablecloth works). Use the backs of your hands, not fingertips, to stretch—fists held under the dough, moving outward gently. Trim thick edges after stretching. The raisins soaked in rum or grappa add a boozy warmth. Dust with powdered sugar immediately after slicing. Serve with vanilla sauce or whipped cream.
Using puff pastry or phyllo (the hand-stretched dough is non-negotiable for proper strudel). Not stretching thin enough (you should see through it). Skipping the butter-toasted breadcrumbs (they absorb moisture and prevent sogginess). Using mealy apples (must be firm and tart). Not resting the dough long enough (it won't stretch properly).
Carol Field, The Italian Baker; Touring Club Italiano, Trentino-Alto Adige in Cucina