Chinese ginger, Fingerroot. Boesenbergia rotunda is a medicinal and culinary herb from China and Southeast Asia. It is widely used in Javanese cuisine in Indonesia. In Thai cooking it is called krachai. In the west it is usually found pickled or frozen. Kra Chai is used as an antiflatulent, expels air and nurtures strength. Used as a male tonic, vigor, health promotion, longevity, aphrodisiac.