Have you heard of mung beans? Organic mung beans are small green beans that have been cultivated since ancient times. They are native to India, but have spread to various parts of Asia. Mung beans are one of the best plant-based sources of protein. They are also rich in essential amino acids, which your body is unable to produce on its own. Mung beans are incredibly versatile, but are mostly used in salads, soups and stir-fry.