To provide a warming and cooking utensil and its method which warm-cooks through the use of a normal pot without necessitating a dedicated pot, reduces the risk of getting burned, etc., reduces the number of utensils required for warming and cooking, facilitates handling and washing, reduces a housing space and a cost and warm-cooks with a keeping proper warmth.

The utensil is constituted of the pot lid 101 of multilayer structure 101 and a pot stand 102 supporting the bottom face part of a pot 103 by means of a supporter 102a to form an air layer under the pot 103 and is used by mounting the pot 103 covered with the lid 101 on the stand 102 at the time of cooking. The utensil is used at the time of warming and cooking through the use of the residual calorie of the pot and its contents by heating the pot to boil the contents once and after then separating the pot from a heat source or stopping the heat source.