This homemade sourdough starter recipe is the jumping-off point to making your own whole-grain sourdough bread (see associated recipe) at home. You need just two ingredients to make this starter—flour and water—but it takes at least 5 days for the starter to develop. Then, once it's ready, it's easy to maintain. Just store it in the refrigerator and feed it according to the directions below. Each time you feed the starter you discard half of it—but don't throw it away! It's perfect for using in pancakes or waffles.