When the pressure is released, use the foil sling to life the cheesecake out of the pot. Carefully remove the foil, and if any moisture has gathered on the top of the cake, simply pour it off. Allow the cake to cook for one hour. Cover the pan with plastic wrap, and then firmly cover with tin foil again. Chill over night. When ready to serve, use a hot knife – run it under hot water for a minute – and run the knife around the outside of the cake to loosen the edges. Carefully remove the side, and cut and serve.