Ready-to-heat canned goods

Canned goods to be heated comprising a heat-resistant can body having an openable section in an upper part thereof, a supply of liquid contained in the can body, and a pressure-responsive container within the can body containing material to be mixed with the liquid, the pressure-responsive container comprising two sections having adjacent surfaces which are sealingly engaged and are relatively movable with respect to each other while maintaining their sealing engagement when the openable section of the can body is closed to maintain isolation of the material therein from the liquid in the can body, the pressure-responsive container being arranged so that the relatively-movable surfaces of the sections separate in response to an increase in internal pressure inside the container to permit mixing of the liquid in the can body with the material in the container in response to heating of the container above a predetermined temperature while the openable section of the can body is opened.