For the legumes: Soak the dried legumes in water overnight, then drain and rinse. (If you are using canned beans, drain and rinse and reduce the water in step 3, to 4 cups/960ml.)
For the lamb: Heat the oil in a large nonstick pot over medium heat and sauté the onions and lamb for 10 to 15 minutes until golden brown. Add the salt, pepper, turmeric