In a large pot, heat the olive oil over medium heat. Add the onion, celery and garlic and sauté until tender, about 6-8 minutes. Add the spices and stir until fragrant.Add the cooked chickpeas and toss to coat with the onion and spices. Add in the stock, salt, and pepper and bring to a boil. Reduce to a simmer and cook for 10-15 minutes.Puree a cup or two of the soup in a blender and stir back into the pot, or blend directly in the pot using an immersion blender. Taste for seasoning.Divide the soup amongst 6 bowls, drizzle each with the juice of â…“ lemon and top with ¼ cup mixed herbs.