Kuku, also spelled as kookoo, is an egg-based and often vegetarian Iranian dish made of whipped eggs folded in various ingredients. It is similar to the Italian frittata, the French quiche, or an open-faced omelette, but it typically has less egg than a frittata, and it cooks for a shorter amount of time, over a low heat, before turned over or grilled briefly to set the top layer. It is served either hot or cold as a starter, side dish or a main course, and is accompanied with bread and either yogurt or salad. In parts of northern Iran, kuku might be used as a midday meal, and might be served with either plain cooked rice or bread.
Cookbooks from Iran's Safavid and Qajar periods mention kuku. Qajar documents introduce it as a side dish.
İn Azerbaijan there are several kinds of kuku such as, "göyərti küküsü" Herb kuku, "Qozlu kükü" walnut kuku and eggplant kuku.