Now, many of you are familiar with baking using packets of dried yeast that you then activate in warm water with a pinch of sugar. But that 'invention' of packaged and ready to use yeast happened only in the last century and a half. Bakers have used the 'wild' yeast present in the air for much longer. Often referred to as a sourdough 'starter', the naturally occurring Saccharomyces species of yeast metabolize the sugars in grains to produce carbon dioxide and leaven the dough, while the presence of Lactobacillus bacteria create a distinctly sour flavour. Saccharomyces is also used for alcoholic fermentation in wine and beer; in fact, some theories have wine and beer as the first leavening agents in bread!
Bread is one of the foods that marks our species' transition from hunter-gatherers to agriculturalists over 10,000 years ago, initially the result of baking a porrige-like concoction of grain and water on hot stones. The flatbreads (think pita and corn tortillas) still form the basis of diets in many cultures, and must have developed independently in places as different as the arid Levant in the Middle East to the humid forests of South America. Then as far back as 6,000 years ago in the bread basket of ancient times, and likely by accident, that fateful mixing of yeast and ground grain results in a leavened loaf.
It's interesting to reflect on the evolution of this staple food over millennia. What is required of me today - mix flour, water, starter, and a bit of salt; let the dough sit for a day or so; and then preheat my oven and bake - is far less arduous than for my predecessors, even without an electric mixer. But I think perhaps less recognized and yet just as drastic is the change in substrate - from coarse whole grains ground with rocks to finely sifted milled flours. The clean white dust, which we call 'All-Purpose' in the US or 'Plain' here in the UK, bears little resemblance to its ancestors (and is of little use in baking a good loaf of bread). And perhaps for that very reason there seems to be a resurgence, even a rennaissance, of artisan baking of late - both in the home and as businesses. After tasting difference, it's not hard to understand why!
Read More:
A Brief History of Bread - The History Channel
The Rise and Rise of Sourdough Bread - The Guardian
Bread and Women - The New Yorker
The History of Bread - The Science of Bread Making
The Story Behind a Load of Bread - Botham's of Whitby (artisan baker)
Yeast Fermentation and the Making of Beer and Wine - Nature Citables
What Makes Whole-Grain Bread So Hard to Bake? - Smithsonian
Sourdough Bread-Baking: The Levain - Chef Turned Soldier
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