When the heat was sufficient the embers were raked out and the pieces of dough placed in the hollows and covered over.
There is an alternate theory regarding the invention of brewing.
Some historians believe it is possible that brewing began when the first cereal crops were domesticated.
At some stage in the Neolithic era people had learned that if, instead of using ordinary grain, they used grain that had been sprouted and then dried, it made a bread that kept unusually well. The Egyptian process was to sprout the grain, dry it , crush it, mix it to a dough and partially bake it.
The loaves were then broken up and put to soak in water, where they were allowed to ferment for about a day before the liquor was strained off and considered ready for drinking." ---Food in History, Reay Tannahill [Three Rivers Press: New York] 1988 (p.48) "Leavening, according to one theory, was discovered when some yeast spores--the air is full of them, especially in a bakehouse that is also a brewery--drifted onto a dough that had been set aside for a while before baking; the dough would rise, not very much, perhaps, but enough to make the bread lighter and more appetizing than usual, and afterwards, as so often in the ancient world, inquiring minds set about the task of reproducing deliberately a process that had been discovered by accident.
51-52) "The brewing of beer may well have occurred soon after the production of cereal crops, and no doubt for a long time beer was home-produced and in the hands of housewives responsible for preparing the gruel or bread..first production of beer may be reasonably considered as an accidental discovery resulting for the malting of grain for other purposes." ---Food in Antiquity: A Survey of the Diet of Early Peoples, Don Brothwell and Patricia Brothwell, expanded edition [Johns Hopkins: Maryland] 1998 (p.
166) On the Web Recommended reading: English Bread and Yeast Cookery, Elizabeth David Six Thousand Years of Bread, H. Jacob The Story of Bread, Ronald Sheppard and Edward Newton Ancient ovens & baking "The most important part of the baker's equipment is, and always has been, his oven.
Sources generally agree the discovery of the powers of yeast was accidental.
"No one has yet managed to date the origins of beer with any precision, and it is probably an impossible task.
The fact ovens based on this simple design formed the majority of those in use throughout Europe until little more than two centuries ago.
Although some of the early Roman ovens had chimnesy to improve the draught and carry away steam, it was many centuries before chimneys were commonly used or dampers incorporated so that the heat could be more effectively controlled." ---The Story of Bread, Ronald Sheppard & Edward Newton [Charles T. 107-109) ""When I break your staff ten women shall bake your bread in one oven, and shall deliver your bread again by weight; and you shall eat, and not be satsified." ---Lev. This type of oven may have been a small earthenware cylindar called tannur in the Bible as it is by present-day rural north Africans who still use it.
The oven opening was closed with a large stone, sometimes sealed with clay.