Double ninth cake, also known as chongyang cake, is a traditional Chinese pastry enjoyed during the Double Ninth Festival, which falls on the ninth day of the ninth lunar month. This cake is typically made from glutinous rice flour and is often layered with sweet fillings like red bean paste or nuts. Its round shape symbolizes unity and completeness. The festival celebrates the elderly and promotes health and longevity. Eating double ninth cake is a way to honor this tradition, as it is believed to bring good fortune and well-being. Families often gather to enjoy the cake together, reinforcing bonds and celebrating life.