Jamieson, Fausset and Brown on Genesis 18:6

6. Abraham hastened ... unto Sarah ... make cakes upon the hearth--Bread is baked daily, no more than is required for family use, and always by the women, commonly the wife. It is a short process. Flour mixed with water is made into dough, and being rolled out into cakes, it is placed on the earthen floor, previously heated by a fire. The fire being removed, the cakes are laid on the ground, and being covered over with hot embers, are soon baked, and eaten the moment they are taken off.