Prepare a large work surface and dust it with all-purpose flour. Place the puff pastry onto the surface and roll it out, back and forth, to create a rectangle. Roll the dough out until it is around 30x24 cm, and around 1/4 inch thick. Note that every package of puff pastry is different. Many are portioned out into smaller portions and some are already pre-rolled. Take note of the type of puff pastry you have and adjust accordingly. I used a 500g package and it was not a pre-rolled kind.