A susceptor for use in the microwave cooking of food, includes a first plastic film, a second plastic film, and a semi-liquid lossy material disposed intermediate the first and second films. The lossy material includes glycerine, sucrose ester, and chloride salt, 25 grams of the lossy material in a 50 ml. glass beaker being heatable to at least 200.degree. C. within 40 seconds by 900 watts of microwave energy in a 1.1 cu. ft. oven. Preferably a layer of paper is sandwiched between the first and second films, the lossy material being absorbed on the paper layer. The susceptor is preferably biodegradable and edible. A method of microwave cooking includes the steps of providing an assembly of such a susceptor and the food to be microwave cooked, cooking the food in intimate contact with the susceptor in a microwave oven, and separating the microwave cooked food from the susceptor.