There are few things in life that smell quite as wonderful as a loaf of freshly baked sourdough bread. That slightly tangy aroma, chewy crust, and soft, airy center make it pretty easy to understand why sourdough has gone from an old-fashioned baking tradition to one of the trendiest breads around. But sourdough isn’t just having a moment because it looks pretty on Instagram. There is something different happening inside that loaf. Unlike conventional bread, sourdough is made using a fermentation process involving wild yeast and lactic acid bacteria. That fermentation changes the dough before it ever reaches the oven,…