Viennese whirl mince pies

Name: Viennese whirl mince pies
Prep time: 20
Cook time: 30
Yield: 12
Ingredients: Sweet Pastry; 125g butter; 125g caster sugar; 1 medium egg; Dash vanilla essence; 250g plain flour; Filling:; 500g mincemeat filling; Viennese whirl topping:; 250g soft butter; 50g icing sugar; 225g plain flour; 25g cornflour; Dash vanilla essence