For the beer-apple strudel, mix flour, salt, egg and oil with beer and water and knead until the dough is silky smooth. Brush with oil and let rest in a warm place for 30 minutes. Then roll out the dough thinly on a cloth dusted with flour.
Cut off the thick edges, melt butter and drizzle on the dough. Now peel apples, cut into thin slices or grate. Spread the butter crumbs, raisins, sugar and cinnamon on the dough.
Finally, spread with whipped cream. Roll up the dough, place on a greased baking tray and bake at 200°C until golden brown. Serve the beer-apple strudel sprinkled with powdered sugar.