Prepare the stew: Heat the olive oil in a large pot over medium. Add the garlic and ras el hanout and stir until fragrant, about a minute. Add the tomato paste and cook, stirring constantly until the tomato paste darkens slightly in color, about 2 minutes.
Add the stock, soy sauce and ½ teaspoon salt and bring to a boil. Reduce the heat to medium-low, cover and cook for 10 minutes, until the sauce slightly darkens in color and its flavors have melded.
Add the chickpeas and simmer until they are warm and soft, about 10 minutes. Add the spinach and stir until wilted and fully incorporated into the stew, about 3 minutes. Taste and adjust seasoning with more salt if needed. If the stew starts getting too thick, feel free to add a few more spoonfuls of stock or water.
Serve the stew warm, with a dollop of Greek yogurt or lemon wedges on the side, and a drizzle of olive oil (or harissa oil), if desired. Enjoy with crusty bread or over grains like couscous, bulgur or rice.
Ras el hanout is widely available online and in larger grocery stores. If you’d like to make your own, stir together the following ingredients: 1 teaspoon each ground turmeric, ground coriander, ground ginger, ground cumin, ground cardamom and ground nutmeg, plus ½ teaspoon each ground aniseed, ground caraway seeds, ground fennel, ground cloves and ground black pepper. (This blend makes about 3 tablespoons ras el hanout.)