Wash rice and soak in water with some salt. Let it rest for at least 1 hour.
Place lamb shanks in a big pot, cover with warm water, and bring to boil.
Add onion, cinnamon sticks, turmeric and cardamom. Let it cook for about 2 hours. At the end of cooking procedure add salt and some brewed saffron.
Bring water to boil in another pot and add fava beans. Boil for about 5 minutes. Drain and pour cold water.
In another pot bring water to boil, drain rice and pour into boiling water, wait for the water to boil again. This may take 6-8 minutes. Drain rice when its hard in the center, do not over cook it.
Mix fava beans and rice. Add some oil to the pot, pour one layer of rice and spread some dried dill, do this until you finish rice.
Cook for about 40 minutes. Serve with lamb shack and its gravy.