Sold dried: a brown ball with a light, brittle shell around an intensely sweet pulp. Cracked open, it is simmered in herbal tea and soups; most come from the hills around Guilin in Guangxi.
A small green gourd native to Guangxi, ~250x sweeter than sugar but with zero calories. Long used in TCM to clear lung heat and treat coughs; now exported worldwide as a natural sweetener (mogrosides).