Carla's Austrian Apple Strudel - Sourdough

Ingredients

• 2 cups wheat flour
• 1 whole egg
• 1/4 cup oil
• 1 tablespoon (wine) vinegar
• 1 cup lukewarm water
• Salt.
• 300g wheat flour
• up to 200ml of water (note the "up to" - start with less!)
• 50g oil (or melted butter)
• 8g vinegar
• 2g salt
• 1 egg
• 1kg apples
• 1/2 cup sugar
• 1/2 cup raisins
• 1 lemon (juice and rind)
• cinnamon ground
• rum (or essence)
• 1/2 cup bread crumbs
• 1/2 cup butter melted
• 1/2 cup milk