Knead flour, salt, oil and water into a medium-firm dough. Divide into 3 small round loaves, brush each loaf with melted butter and let sit for 1 hour.
Peel, core and slice apples. Mix in granulated sugar, raisins, grated lemon peel, lemon Juice, rum, cinnamon and blend together well.
Roll the dough loaves with a rolling pin, then stretch rolled dough on a strudel sheet with the backs of your hands. Coat 2/3 of dough sheet with buttered breadcrumbs, spread apple filling over remaining 1/3 of dough. Tear off edges, shape strudel into roll by lifting strudel sheet. Place strudel on a buttered baking sheet and brush with melted butter. Bake strudel for 60 to 90 minutes in a 400 degrees F to 425 degrees F oven.