Musakhan... Chicken with sumac-seasoned onions. This recipe is not exactly the way I make it, but it is very close. This delicious recipe capitalizes on my favorite ingredient... onions. For some reason, cooked onions are my kryptonite. I just love them! To make this recipe even better, season the chicken with cinnamon, cardamom, allspice, salt, and pepper rather than just salt and pepper. If you can't find Arabic flatbread, just use tortillas. They are just as good.