It's always best to buy Korean items at your local Korean grocery store, but I know that's not always possible, so I chose some products on Amazon that are good quality. See more about how these items were chosen.
These split yellow beans, which are the size of lentils, have had their outer skins removed. Once the green skin of mung beans are removed, they reveal the wonderfully yellow bean underneath. Look for them in the dried beans and grains section of Korean grocery stores, natural foods stores, and large supermarkets.