A cooking pan is provided with an open inner cooking pan member and an outer shell member sealed to the inner pan to form an enclosure between the members. The inner pan and outer shell are sealing secured together with a gasket, a plurality of insulating washers and insulating sleeves therebetween so that there is no metal-to-metal contact between the inner and outer members. Water is added to and heated in the enclosure to form pressurized steam, controlled by a pressure control valve fixed to the inner pan, so as to allow high temperature, pressurized steam to quickly heat the inner pan and cook food items, such as sauces and the like, held therein, without burning them.