I always try to defrost stuff before I reheat as it just comes out better. I usually just bring it down to the refrigerator from the freezer a day or two before I know I need to use it then just heat it up like I would any other food in the fridge. If it's a case of emergency and I need it RIGHT NOW, then depending what it is, I defrost it in a pot on the stove over low heat. If it's something for the oven, I try to avoid that because it usually gets overly wet for some reason. At least my lasagnas have when I've tried to cook them directly from the freezer while their still frozen. HTH. :)