Before you begin, you can either allow one puff pastry sheet to thaw at room temperature for 35-40 minutes, until soft enough to work with, OR you can heat the frozen puff pastry sheet in the microwave for 15 second intervals until it softens up. Just be careful not to overheat the dough; if using the microwave method, heat JUST until the dough begins to soften and is easier to unfold.