Question: What vegetable originating near the Beijing region of China is used in Haejang-guk?

Context paragraphs:
Kananaskis Country: Kananaskis Country is a park system situated to the west of Calgary, Alberta, Canada in the foothills and front ranges of the Canadian Rockies.  Kananaskis Country can be accessed by three highways that run into or through the area: Highway 40, a 66 km segment of the Bighorn Highway and also known as Kananaskis Trail; Highway 66, a 28 km highway originating near Bragg Creek known as Elbow Falls Trail; and Highway 68, a 42 km gravel highway originating from the Trans-Canada Highway (Highway 1) known as Sibbald Creek Trail.

Ya cai: Ya Cai (芽菜), is a pickled vegetable originating from the Sichuan province of China.  It is made from the upper stems of a variety of mustard green.  Ya Cai is more pungent than the similar zha cai.

Czarna Hańcza: The Czarna Hańcza, Čornaja Hanča (Belarusian: Чорная Ганча , Lithuanian: "Juodoji Ančia" ) is the largest river of the Suwałki Region of north-eastern Poland and the Sapockin region of north-western Belarus.  It is known for having large postglacial boulders.  Originating near Lake Hańcza (the deepest lake in Poland with the maximum depth of 108.5 m) and flowing through lake Hańcza and Wigry Lake (the location of Poland's Wigry National Park), it is a tributary of the Neman River beyond the borders of Belarus and Lithuania.

Zha cai: Zha cai (榨菜 literally "pressed vegetable") is a type of pickled mustard plant stem originating from Sichuan, China.  The name may also be written in English as "cha tsai", "tsa tsai", "jar choy", "jar choi", "ja choi", "ja choy", or "cha tsoi".  In English, it is commonly known as Sichuan vegetable, Szechwan vegetable, or Chinese pickled vegetable, although all of these terms may also refer to any of a number of other Chinese pickles, including the several other types in the Sichuan province itself.

Gushan Environmental Energy: Gushan Environmental Energy Limited (), is a biodiesel producer in China that was incorporated on May 16, 2006.  The Company produces biodiesel and by-products of biodiesel production, including glycerol, plant asphalt, erucic acid and erucic amide.  Biodiesel is a renewable, clean-burning and biodegradable fuel produced from a variety of feedstocks, such as vegetable oil, animal fat and recycled cooking oil.  Currently there are 5 production facilities located in Beijing, Shanghai, Mianyang in Sichuan province, Handan in Hebei province and Fuzhou in Fujian province, serving the northern, interior and southeastern regions of China respectively.  Biodiesel is used to fuel a range of diesel engines, typically after blending with diesel, including diesel engines found in trucks, mass transit vehicles, marine vessels and generators.  The by-products of its biodiesel production have commercial applications in the food, pharmaceutical and manufacturing industries.  The Company sells its products in China to direct users, including marine vessel operators, petroleum wholesalers and individual retail gas stations.  The Company primarily uses vegetable oil offal and used cooking oil to produce biodiesel.  It acquires the raw materials supply for each of its production facilities primarily from local suppliers.

Lacaune (sheep): The Lacaune is a breed of domestic sheep originating near Lacaune in southern France.  The Lacaune is the most widely used dairying sheep breed in France, with a population of about 800,000 ewes.  Notably, it is the predominant breed used in the production of Roquefort cheese in France.

Tianjin preserved vegetable: Tianjin preserved vegetable (; literally "Tianjin winter vegetable"; also called tung tsai (), Tientsin preserved vegetable or Tianjin preserved cabbage) is a type of pickled Chinese cabbage originating in Tianjin, China.  It consists of finely chopped Tianjin cabbage (箭杆菜; a variety of Chinese cabbage with an elongated shape) and salt.  Garlic is also generally added in the pickling process, although it is omitted in versions prepared for consumption by members of certain Chinese Buddhist sects, who practice strict Buddhist vegetarianism and do not consume garlic or other spicy foods.  This pickled vegetable is used to flavor soups, stir fries or stewed dishes.

Kamchatka earthquakes: Three earthquakes, which occurred off the coast of Kamchatka Peninsula in far eastern Russia and the Soviet Union in 1737, 1923 and 1952, were megathrust earthquakes and caused tsunamis.  They occurred where the Pacific Plate subducts under the Okhotsk Plate at the Kuril-Kamchatka Trench.  The depth of the trench at the point of the earthquakes is 7,000–7,500 m. Northern Kamchatka lies at the western end of the Bering fault, between the Pacific Plate and North American Plate, or the Bering plate There are many more earthquakes and tsunamis originating from Kamchatka, of which the most recent was the 1997 Kamchatka earthquake and tsunami originating near the Kronotsky Peninsula.

Haejang-guk: Haejang-guk (해장국 ) or hangover soup refers to all kinds of "guk" or soup eaten as a hangover cure in Korean cuisine.  It means "soup to chase a hangover" and is also called "sulguk" ().  It usually consists of dried Napa cabbage, vegetables and meat in a hearty beef broth.  One type of haejangguk, Seonjiguk, includes sliced congealed ox blood (similar to black pudding) and another type, Sundaeguk includes a kind of blood sausage made with intestine stuffed with pig's blood and other ingredients.

Napa cabbage: Napa or nappa cabbage ("Brassica rapa" subsp.  "pekinensis" or "Brassica rapa" Pekinensis Group) is a type of Chinese cabbage originating near the Beijing region of China, and is widely used in East Asian cuisine.  Since the 20th Century it is also a widespread crop in Europe, America and Australia.  In much of the world, this is the vegetable referred to as "Chinese cabbage".

Supporting paragraphs: Haejang-guk Napa cabbage
Answer: Napa cabbage