Sourdough is believed to have originated in Ancient Egyptian times around 1500 BC, and was likely the first form of leavening available to bakers. This is amazing bread, is not difficult but does take some advance planning. The recipe and the step-by-step (and I do mean step-by-step) instructions come from Cook's Illustrated! The key is to use healthy refreshed starter. NOTE: If you are short on time, step #21 can be skipped, however the taste of bread will be effected slightly. Let me know if you need more information on how to refresh your starter.