Heat the olive oil over medium-high heat in a medium, heavy-bottomed frying pan for which you have a tight fitting lid. Add the onion and garlic and sauté for 6 minutes to soften and color a bit. Raise the heat to high, add the lamb, and brown well, 5 to 6 minutes. Season with sumac, cumin, ¾ teaspoon salt, and some black pepper and cook for another minute. Turn off the heat, stir in the nuts, harissa, and preserved lemon and set aside.

While the onion is cooking, heat a separate small caste-iron pan over high heat. Once piping hot, add the cherry tomatoes and char for about 4-6 minutes, tossing them in the pan occasionally, until slightly blackened on the outside. Set aside.

Prepare the yogurt sauce by whisking together all the ingredients with a pinch of salt. In needs to be thick and rich but you may need to add a slash of water if it is stiff.

Add the chicken stock to the meat and bring to a boil. Make 4 small wells in the mix and break an egg into each well. Cover the pan and cook the eggs over low heat for 3 minutes.

Remove from the heat and dot with dollops of the yogurt sauce, sprinkle with sumac, and finish with cilantro.