made from various grains worldwide, including the Mexican tortilla, Indian chapatis, rotis and naans, Scottish oatcake, North American johnnycake, Middle Eastern Pita bread (Kmaj in Arabic and Pitot in Hebrew) and Ethiopian injera. The basic flat breads of this type also formed a staple in the diet of many early civilizations with the Sumerians eating a type of barley flat cake, and the 12th century BC Egyptians being able to purchase a flat bread called ta from stalls in the village streets.[1]
The development of leavened bread can probably also be traced to prehistoric times. Yeast spores occur everywhere, including the surface of cereal grains, so any dough left to rest will become naturally leavened. Although leavening is likely of prehistoric origin, the earliest archaeological evidence is from ancient Egypt. Scanning electron microscopy has detected yeast cells in some ancient Egyptian loaves. However, ancient Egyptian bread was made from emmer wheat and has a dense crumb. In cases where yeast cells are not visible, it is difficult, by visual examination, to determine whether the bread was leavened. As a result, the extent to which bread was leavened in ancient Egypt remains uncertain.[2]
There were multiple sources of leavening available for early bread. Airborne yeasts could be harnessed by leaving uncooked dough exposed to air for some time before cooking. Pliny the Elder reported that the Gauls and Iberians used the foam skimmed from beer to produce "a lighter kind of bread than other peoples." Parts of the ancient world that drank wine instead of beer used a paste
composed of grape juice and flour that was allowed to begin fermenting, or wheat bran steeped in wine, as a source for yeast. The most common source of leavening however was to retain a piece of dough from the previous day to utilize as a form of sourdough starter.[3]
Even within antiquity there was a wide variety of breads available. In the Deipnosophistae, the Greek author Athenaeus describes some of the breads, cakes, cookies, and pastries available in the Classical world. Among the breads mentioned are griddle cakes, honey-and-oil bread, mushroom shaped loaves covered in poppy seeds, and the military specialty of rolls baked on a spit. The type and quality of flour used to produce bread could also vary as noted by Diphilus when he declared "bread made of wheat, as compared with that made of barley, is more nourishing, more digestible, and in every way superior." In order of merit, the bread made from refined [thoroughly sieved] flour comes first, after that bread from ordinary wheat, and then the unbolted, made of flour that has not been sifted."[4]