Miso is a wonderfully nutritious ingredient to cook with that serves as a great source of protein. You can find white miso at organic supermarkets, as well as in the Asian section of many conventional supermarkets. Buckwheat soba noodles are a pasta that is made with whole grains, and can be found in the Asian section of conventional supermarkets. Lillie Tierney suggests upping the amount of vegetables in your soup, and keeping the portion of soba noodles to about 1/2 cup.