1) Assemble your lasagna in the roasting/baking pan and then allow it to cool completely.  2) Tightly wrap the whole lasagna, including the sides of the pan with cling film3) Cover the top with a layer of foil. 4) Store it in your refrigerator overnight.  5) To cook, sit the lasagna on the kitchen counter at room temperature, wrappings removed, for 30 minutes while the oven preheats.  6) Cook as per the recipe instructions.