Xinhui red tangerine, Xinhui tangerine peel, Du Ruan Liang Gua. The three treasures of Jiangmen are Xinhui red tangerine, Xinhui tangerine peel and Du Ruan Lianggua. Xinhui red tangerine, whose scientific name is Chazhi tangerine, has a cultivation history of more than 600 years. Xinhui tangerine peel is the dried peel of red orange produced in Xinhui and has high medicinal value. Du Nguyen Liang Gua (also known as Bitter Melon) is characterized by a thick melon shape, similar to a papaya in shape, a sloping roof with thick grains, and thick green flesh.