Sentence:  <WSD>Overfired</WSD> grills, or salamanders, can, in addition, be used for making toast and salamandering. They have the heat source above the food .... This may comprise sets of burners firing below refractory or metal frets, or surface combustion plaques. 
Meaning of the word marked with <WSD> tags:  Of a cooker: having a heat source that is above the food being cooked.