The common Lebanese street bread often sprinkled with sesame seeds is ka'ak.
Lebanese ka'ak is typically formed from sweet dough rolled into ropes, joined into rings, and covered with sesame seeds before baking. Street vendors often sell the rings from wheeled carts, where they may be carried on a pole through the center opening.
Unlike Jerusalem ka'ak, which is usually an elongated, crusty ring, Lebanese ka'ak is often sweeter and may be glazed after baking with milk and sugar before being dried. It can be eaten as a snack or breakfast bread and is also used in dishes such as ka'ak knafeh.
Ka'ak is a broad Middle Eastern food name, so it does not describe only one recipe. Across the region it can refer to breads, biscuits, and festive pastries. That variety is why it is sometimes confused with other sesame-covered ring breads, but the Lebanese street-bread clue points specifically to ka'ak.