Now, sourdough bread is having its moment in Maine. Many of my friends are making and selling homemade sourdough, and it’s flying off the shelves as soon as it’s baked. In the winter especially, sourdough has become the perfect pastime. And really, who doesn’t love homemade sourdough? In a state like Maine, where traditions quietly evolve instead of disappearing, sourdough feels like the latest chapter in a very familiar story.