The phrase "real sourdough" means bread that is made using a traditional fermentation process, resulting in a tangy flavor and unique texture. Full definition
Bread I posted the other day about real sourdough bread, and how the long fermentation using a sourdough starter helps to reduce phytic acid. (cheeseslave.com)
Traditional sourdough is made with sourdough starter and this basic flour and water leavening agent is crucial to the process of making real sourdough and more importantly its flavour and the healthy gut supporting properties. (garlicmatters.com)