A Native American Recipe from Organic Gardening Magazine from the 80's. As it appears here it is a great lacto ovo vegitarian dish. If this is not an issue feel free to add some chopped ham to the soup or to replace the oil with bacon drippings. The Three Sisters are Maize (corn), Beans and Squash. They were often grown together in the same field. The beans used the cornstalks for support and fixed nitrogen in the soil which the corn needed. The large leaves of the squash shaded the roots of the corn and beans and helped to conserve the water in the soil. They were often cooked and eaten together. The corn completes the incomplete protein of the beans and the squash added beta carotines.