Prepare the seasoning: in a small bowl, combine the chili powder, cumin, smoked paprika, oregano, coriander, and salt. Mix well and set aside.
Brown the lamb: heat a little olive oil in a large skillet over medium-high heat. Add the ground lamb and cook, breaking it apart as it browns. Once cooked through, tilt the pan and carefully drain or spoon off the excess fat.
Add the seasonings: stir in the prepared spice blend, tomato paste, harissa sauce, and minced garlic. Cook for a couple of minutes to allow the tomato paste and spices to bloom.
Simmer with chickpeas: add the water and drained chickpeas. Stir to combine, cover, and let simmer. Add more water as needed to keep the mixture saucy.
Thicken the mixture: lightly mash some of the chickpeas into the lamb.
Finish the lamb: add a small splash of lemon juice and a drizzle of honey. Taste and adjust as needed.
Make the dressing: combine the yogurt, feta, 2 tsp lemon juice, and 1 tsp honey. Blend with an immersion blender until creamy. A little feta texture is perfectly fine.
Prepare the salad: toss chopped cucumbers and bell peppers with lemon juice, olive oil, and a little salt.
Serve: spoon the harissa lamb into bowls and drizzle with the yogurt feta dressing. Top with fresh arugula and serve with warm homemade naan and the fresh cucumber pepper salad.