Yu Choy (aka Choy Sum in Cantonese or You Cai in Mandarin) is a common Chinese leafy green vegetable. It’s not bitter nor sweet. The flavor is a cross between broccoli and kale. It is similar to Chinese broccoli (aka Gai Lan in Cantonese or Jie Lan in Mandarin), but with skinnier stems, slightly sweeter, and can have small yellow flowers. The most common way to cook the vegetable is to saute it with garlic. It is also often blanched and added to soup noodles.