Zucchini Musakka with Tomatoes and Chickpeas

The word musakka (spelled moussaka in Greece, and mussak’a in Lebanon and Syria) describes different dishes in different countries. This southern Turkish version has been popularized by Musa Dağdeviren, a tall, talkative, playful Turkish chef who does more miraculous things with vegetables than anyone else I know. His restaurant, Ciya, on the Asian side of Istanbul, is a national treasur