Now, for this next step you have to act pretty quickly. When the cheesecake’s time is up, open the oven door, pull the wrack out but keep the cake in the tray and the tray in the oven. Scatter the chopped nuts carefully over the cheesecake, as evenly as possible. Pour over the thick and darkly sweet mixture, trying to coat the cake as evenly as you can—again, without taking too much time. Try to pour it gently so the nuts don’t puncture the surface of the cheesecake. You also don’t want to get to finicky about spreading it out because it can cause the nuts to pierce the top of the cheesecake custard, which, because its still under baked within, would be detrimental to your cake. Immediately slide the wrack back in the oven and close the door. The reason you have to work quickly here is because you do not want to expose the cheesecake to the cooler temperature outside of the oven too quickly or for too long; this is one of the causes of a cheesecake’s cracking or deflating too much.