Defrosted and roll out the puff pastry, about 24cm x 24cm square. Sprinkle the sugar on top of one baking parchment , then place a puff pastry on top of it, press hard.

Then brush the melted butter on top of the pastry, sprinkle more sugar on top. Use your hand to press it and make sure it sticked. 

Then fold each long end towards the middle, fold it tightly. To hold the shape, you can wrap it with clingfilm and chill in fridge for 20 minutes. Slice it into about 18 pieces, place on parchment paper, 2 inches apart. Bake in preheated oven at 180C for about 15 to 20 minutes, or until golden. Transfer to a wire rack and cool completely.