Sourdough was quite the trend in quarantine last year. Now that we've got a taste for it, we're never going back! Making this kind of bread has a little bit of a science to it, so we turned to a sourdough expert for all the explanations. Charity Lighten shares everything you need to know about sourdough. She shares how make a start, how to keep a start, and important factors that go into making your loaf perfect.