Soak the chickpeas overnight, then drain and rinse them.
Peel and chop the potato, tomato, and onion. Mince the garlic.
In individual clay pots (or a large pot if preferred), layer the lamb chunks at the bottom.
Add the chickpeas, potato cubes, chopped onion, chopped tomato, dried plums or apricots, and chestnuts (if using).
Sprinkle with minced garlic, ground turmeric, salt, and pepper.
Pour enough water into the pots to cover the ingredients. Bring to a boil, then reduce the heat to low and let it simmer.
Cover the pots and simmer for about 2 to 2.5 hours, or until the lamb and chickpeas are tender.
About 30 minutes before the end of cooking, stir in the saffron water.
Enjoy your meal!