Start with the smaller amount of the miso, and add more as needed, dissolving extra spoonfuls in hot soup liquid. If you have both dark and light misos on hand, use half of each for a more complex flavor. Bean thread noodles are readily available in many supermarkets. If fresh edamame are already cooked, add them to the soup at the last minute. This serves 3 as a main course, but 6 as an appetizer.