The arrangement of a bed of fuel under a grill is of some importance. It should not only be regulated according to the nature and size of the item to be grilled but also in such a manner as to allow the production of more or less heat according to circumstances. Thus the bed should be arranged in an even layer in the centre but varying in thickness according to whether the fire should be more or less fierce. It should also be raised at those sides which are in contact with the draught of air in order that the entire burning surface may present an equal degree of heat.