A soybean with a black skin and a yellow or green inside, not the black turtle bean of Latin American cooking. Whole ones are cooked in soups, and fermented, salted ones are 豆豉.
She drinks a bowl of black soy milk every morning.
Tips
culture
In traditional Chinese medicine 黑豆 is said to 'nourish the kidneys' (补肾) and promote black hair. It is the base of fermented black bean sauce (豆豉) used in Cantonese cooking.