Tangyuan and Yuanxiao are the must-have snacks during the Lantern Festival, celebrated on the 15th day of the first lunar month. They are both round sticky dumplings with fillings, but there are also distinct differences, with Yuanxiao more popular in northern China and Tangyuan in the south. [Photo/China News Service]

Cooks use rolling pins to prepare black sesame seed as filling for Yuanxiao. [Photo/China News Service]

The black sesame seed filling is cut into small pieces. [Photo/China News Service]