Abstract: A roasting jack moved by radiation from a fire having a shaft mounted in a system of bearings permitting the shaft to rotate about its axis, a rotating unit in the extension of the shaft and in an extended position in relationship to the system of bearings to permit free rotation of the shaft, the rotating unit having a first portion supporting the roasting food piece and a second portion between the shaft and the first portion and able to curve under the effect of differential expansion resulting from the difference in temperature of the generatrix which receives direct radiation from the fire and that diametrically opposite.