yu choy sum
Pronunciation: [yoo choy SUM]
A relative of bok choy, this vegetable has long, graceful yellow-green stems with dark green leaves and, sometimes, tiny yellow or purple flowers. It has a tangy flavor akin to spinach and is wonderful steamed or stir-fried (see stir-fry) or added to soups. Yu choy sum is available in Asian markets. Choose unblemished bunches with firm stalks and brightly colored leaves. Refrigerate in a plastic bag for up to 1 week and wash well before using. See also choy sum.