Napa, or nappa cabbage (Brassica rapa subsp. pekinensis), also known as sui choy, celery cabbage, is a type of Chinese cabbage originating near the Beijing region of China, and is widely used in East Asian cuisine. In much of the world, this is the vegetable referred to as "Chinese cabbage". Nappa cabbage is lighter in color than other Chinese cabbages such as bok choy, which is also sometimes called Chinese cabbage. In the United Kingdom, this vegetable is known as "Chinese Leaf", in New Zealand, as "Wong Bok" or "Won bok", and in Australia and the Philippines as "wombok".
The name "nappa" comes from colloquial and regional Japanese, where nappa refers to the leaves of any vegetable, especially when used as food. The Japanese name for this specific variety of cabbage is hakusai, lit. "white vegetable", a Sino-Japanese reading of the Chinese name.
Nappa cabbage is widely used in China, Japan, and Korea, where it is particularly popular in South Korea's northern Gangwon Province. Nappa cabbage is used as a sign of prosperity in China, and its image often appears as a symbol in glass and porcelain figures. The famous Jadeite Cabbage sculpture of Taiwan's National Palace Museum is a carving of a nappa cabbage variety. Because of immigrants from these nations, it is also readily found in many North American, European and Australian cities.
In Korean cuisine, sui choy is the main ingredient of baechu kimchi, the most common type of kimchi, but is also eaten raw as a wrap for pork or oysters, dipped in gochujang. The outer, tougher leaves are used in soups. The flavor has been described by some as delicate compared to bok choy or cabbage, and it can be used in stir-fry with other ingredients such as tofu, mushroom or zucchini. It is also a very common ingredient that is eaten with hot pot.