Yu Choy

Yu choy is a type of Chinese cabbage with a delicate sweet flavor. Yu choy or yau choy is a pretty dark green leaf with small yellow flowers. At maturity the green is up to 12" long. To prepare, large leaves can be cut into smaller pieces but if the plant is young and small just trim away any brown material around the base. To cook, blanch the greens briefly then stir-fry or saute.

You can substitute equal amounts of bok choy for yu choy
OR depending on the dish you can substitute fresh spinach (different flavor).