1. Heat the oil in the casserole over medium-high heat. Add the lamb and chicken and cook, turning occasionally, about 6 minutes. Transfer to paper towels to drain.

2. Add the eggplant, red pepper, onion, and garlic to the casserole and cook, stirring occasionally, about 4 minutes. Stir in the harissa, paprika, and turmeric and cook for 1 minute.

3. Return the lamb and chicken to the casserole. Add the zucchini, stock, beans, tomatoes, and chorizo and season with salt and pepper. Bring to a boil. Reduce the heat to low and cover. Simmer about 1 hour, or until the meats are tender.

4. Strain the mixture in a colander set over a wide skillet. Transfer the meat and vegetables to a platter and cover to keep warm. Boil the strained liquid over high heat for about 5 minutes, or until slightly reduced. Season with salt and pepper.

5. Bring 3 cups water and ½ tsp salt to a boil in a large saucepan. Stir in the couscous and remove from the heat. Cover and let stand until the couscous is tender, about 5 minutes. Stir the meats and vegetables into the couscous. Pour the sauce on top and sprinkle with the cilantro. Serve hot.