Pre heat oven 200°C

In a medium bowl, toss apricot with arrowroot, sugar, vanilla, lemon juice until there are no lumps. Set aside for 10 minutes

Place pastry on a lightly flour surface, cut into 4 squares

Spoon apricots evenly into each square and gently pull one side over to the other, making a triangle

Use a fork to seal edges, brush with egg wash and cut a few slits in the top of each to allow steam to release. Sprinkle with demerara sugar and bake for 20 minutes or until risen and golden

Serve dusted with icing sugar