Slice potato lengthwise and cut into slices about 1/4 inch. Heat the oil in a small saucepan and cook potatoes and garbanzo beans over low heat until browned. Add the tamari and continue to cook over low heat (covered) until the potatoes are done (about 15 minutes) and most of the liquid has evaporated. If a crispy crust is desired, place the contents in a shallow pan and broil for several minutes. This sounds strange, but I promise it is, indeed delicious. Most of all it is nutritious because it is high in fiber and a complete protein. It can be doubled.