These beans have many uses in Korean cuisine: they are used in porridges, pancakes, as filling for desserts, or to grow mung beans to be used in other dishes. They have a nutty flavor and are similar in taste to red beans (aka Azuki beans). They also have many uses when dried and shelled. Find them in a Korean grocery store with the beans and grains.
My cookbooks
Which to get? my first book has all the recipes for all the essential Korean pastes and sauces, but my second book Maangchi's Big Book of Korean Cooking has more recipes. Both are best sellers and either one is a good choice if you want to learn Korean home cooking.