A removable oven for use on a cooking grill including a cooking chamber formed in a high temperature housing with an open bottom. The open bottom of the high temperature housing fits over a lower cooking plate positioned over the grill. A repositionable upper cooking plate is located in an upper region of the cooking chamber thereby forming a gap that can be varied to control the heat between the cooking plates. A chimney connected to the cooking chamber further controls the heat between the cooking plates. The lower cooking plate can be made to rotate when placed on a rotating assembly.