This is an amazing bread mix. If you own a bread machine, you owe it to yourself to try this sourdough bread mix! his is unlike any bread you've made. Now you can make wonderful, chewy, sourdough bread with that unique San Francisco sourdough flavor. The California settlers relied on natural yeast spores to raise their breads and a good sourdough starter was prized and guarded. In the wet, cooler climate of San Francisco Bay, yeast spores and therefore starters, were different and San Francisco breads were distinctive with a unique sourdough flavor that is famous around the world.The Prepared Pantry