Preheat the oven to 200˚C.
Cut four circles out of each piece of puff pastry, making 24 circles all up.
Fold the circles in half and place them on lined baking trays. Brush with the prepared glaze, and sprinkle with a little extra castor sugar.
Bake in the oven until golden brown, about 10 - 15 minutes. Remove from oven and allow to cool completely.