The Complete Handbook of Gai Choy

Chapter 1: Understanding Gai Choy

Gai choy is a leafy vegetable, but it is not a single plant. The name is a loose English rendering of the Cantonese term for the leafy mustard greens that have been a staple across southern China for centuries. In botanical terms, most gai choy found in the market is Brassica juncea var. foliosa, a subspecies classified broadly as Indian or brown mustard. It is a close relative of cabbage, broccoli, and kale, all of which descend from the same ancestral species, but gai choy holds a distinct place in the produce aisle because of its bitter, pungent character and its unique response to cooking. Unlike a head of cabbage that is grown for a single dense organ, gai choy is cultivated for its loosely arranged leaves and petioles, which are often harvested entire as a rosette or as individual leaves cut at the base.

Understanding the plant begins with its name. "Gai choy" is the transliteration of a Cantonese phrase that refers to this mustard green, and it is the term most commonly used by English-speaking consumers, wholesalers, and growers on the West Coast of North America. In Mandarin, the same plant is called jie cai, and in various English seed catalogs it might be listed as "leaf mustard," "bamboo mustard," or "Indian mustard." The nomenclature matters less than the underlying reality: gai choy is always a member of the Brassica juncea species, which is known for producing plants that thrive in