Add the lamb, chickpeas, onion, carrots, zucchini, and garlic to the slow cooker.
Pour in the diced tomatoes and chicken broth.
Sprinkle the cumin, coriander, cinnamon, paprika, ginger, salt, and pepper over the top.
Stir everything together until the spices are evenly distributed.
Cover and cook on low for 7 to 8 hours or on high for 4 hours, until the lamb is tender.
Taste and adjust salt if needed.
Ladle into bowls and top with chopped cilantro. Serve with lemon wedges on the side.