disclosed is a device for simultaneously heating and cooling adjacent food portions . a first module defining a first hollow chamber is formed into a substantially planar surface for supporting the food portion to be cooled . the first chamber contains a vaporizable substance in equilibrium with vapor . a second module defining a second hollow chamber is likwise formed into a substantially planar surface for supporting the food portion to be heated . the second chamber contains a sorbent and is evacuated . the chambers are fluidly interconnected by a conduit having a normally closed valve to prevent egress of vapor from the first chamber . in use , the valve is open , allowing vapor from the first chamber to flow into the evacuated second chamber . the resulting drop in pressure allows the vaporizable substance in the first chamber to change phase into vapor , thereby cooling the first chamber and its associated food portion . moisture in the vapor entering the second chamber is absorbed by the sorbent , which evolves chemical reaction heat , thereby heating the second chamber and its associated food portion . the first and second modules of the present invention may be conveniently placed in adjoining pockets of a foam container for containing the cold and hot portions of a sandwich or other fast food .