Gai choy/ Mustard green has a deep and robust flavor that is savory and aromatic with a pleasant lingering bitterness.Popular in soups and stir-fries. Young, Fresh Gai choy is tender. Its pungent flavor can also be preserved by pickling in brine or sugar. Fresh Gai choy combines well with garlic, ginger or black bean sauce and is entirely edible.It pairs very well with rich fatty meats, other vegetables, acid, and herbs.