How to Make It
In a large enameled cast-iron casserole, cook the lamb fat over moderately low heat until rendered and the cracklings are golden brown, about 10 minutes. Remove the cracklings with a slotted spoon and drain on paper towels. Season with salt. Leave the fat in the casserole.
In a medium bowl, season the lamb with 2 teaspoons of salt and 1 teaspoon of pepper. Add one-third of the lamb to the casserole and cook over moderate heat until browned, 5 to 7 minutes. Using a slotted spoon, transfer the browned meat to a plate. Repeat with the remaining lamb.
Add the onions to the casserole and season with salt and pepper. Cook, stirring occasionally, until golden brown, 8 to 10 minutes. Stir in the garlic and cook until fragrant and lightly browned, 2 to 3 minutes. Add the shredded carrots to the casserole along with the cumin and za'atar and cook, stirring occasionally, until the carrots are just softened, about 2 minutes.
In a saucepan, bring the beef broth to a simmer. Return the lamb and any accumulated juices to the casserole along with the rice. Add 2 cups of the broth to the rice and cook, stirring, until it is absorbed, about 4 minutes. Repeat with another 2 cups of broth, cooking until absorbed. Stir in the remaining broth. Cover and simmer over moderately low heat until the rice is tender, about 10 minutes. Remove the casserole from the heat and let stand uncovered for 10 minutes before serving. Garnish with the cracklings and parsley and serve.
Ask your butcher for lamb fat.