This is Eyyachi's claim to fame. Around the corner from the grill, not quite in back of the building, are in-the-ground ovens used to roast Eyyachi's renowned mechoui.Mechoui, which literally means "cooking over an open fire," is a general term which refers to roasted meat. Mechoui is traditionally prepared with a whole lamb, either by cooking on a spit over a fire, or alternatively in a pit in the ground as done here.
The cinder blocks in the background are not connected to the ovens, which are contained within the elongated mound in the foreground. The steps in the lower right of the photo are used to climb atop the mound and access the mechoui pits from above.