In a heavy medium pot, sauté onion in oil until it starts to change color, about 7 minutes. Add drained fava beans, dill weed, and turmeric. Stir for a few minutes. Add 3¾ cups (875ml) hot water, bring to a quick boil, then reduce heat to medium, and let beans boil gently, covered, until they are almost done, about 5 minutes. Do not let them overcook. Test by biting into o