Apple strudel with vanilla sauce

Ingredients

• 10 sheets of puff pastry or use one large sheet
• 5 apples (e.g. Jonagold or Elstar)
• 2 tablespoons lemon juice
• 1 teaspoon ground cinnamon
• 1 sachet of vanilla sugar
• handful of raisins
• 2 tablespoons all-purpose flour
• 1 egg
• 150 ml milk + 1 tablespoon extra
• 200 ml cream
• 1 tablespoon vanilla extract or 1/2 vanilla pod
• 50 gram sugar + 1 tablespoon extra
• 4 egg yolks
• powdered sugar