Choy sum is a Chinese phrase meaning stems and flowers. It is used to refer to a flowering vegetable closely related to bok choy which produces thick, crunchy stalks, yellow flowers, and lush green leaves. It is used in a variety of Chinese foods, usually stir fries and soups, and many Asian markets carry choy sum, usually with other vegetables such as bok choy and Chinese broccoli. It is also possible to grow choy sum at home in temperate climates, for cooks who have difficulty obtaining it in the marketplace.
