Mustard is used as the root. Its root is shaped like a radish and is also called kohlrabi and mustard pimple. Because of its spicy taste, it is also called spicy pimple. Wang Zhen of the Yuan Dynasty wrote "Nongshu" to explain mustard greens: "Its smell is pungent, and if it is neutral in the dish, it will look like it is tough when eaten, so it is named Congjie."

Origin of Mustard Pimples It is an ancient vegetable in my country with a long history of cultivation. It is cultivated in all parts of the north and south of my country, and is more common in the southwest. After long-term cultivation and selection of mustard, many types and varieties have emerged. Root mustard is a variety of mustard. Mustard knot is an annual or biennial herbaceous plant of the Brassicaceae family. It likes cold weather and is only cultivated in autumn. Its biological characteristics and cultivation techniques are similar to those of autumn radish. Mustard leaves are oval, dark green, and there are also red or red and green varieties. The flowers are yellow, and the fleshy roots are fat and conical or cylindrical.