|Place of origin||Japan|
|Serving temperature||Hot, cold|
Soba ( or ) (, Japanese pronunciation: [soba]) is the Japanese name for buckwheat. It usually refers to thin noodles made from buckwheat flour, or a combination of buckwheat and wheat flours (Nagano soba). They contrast to thick wheat noodles, called udon. Soba noodles are served either chilled with a dipping sauce, or in hot broth as a noodle soup.
In Japan, soba noodles are served in a variety of settings throughout Japan, but are also served by expensive specialty restaurants. Markets sell dried noodles and men-tsuyu, or instant noodle broth, to make home preparation easy. There are a wide variety of dishes, both hot for winter and cold for summer, using these noodles.
Soba can nutritionally complement other grains like white rice and wheat flour. Thiamine, missing from white rice, is present in soba. Soba contains all eight essential amino acids, including lysine, which is lacking in wheat flour. The tradition of eating soba arose in the Edo period.
The tradition of eating soba originates from the Tokugawa period, also called the Edo period, from 1603 to 1868. In the Tokugawa era, every neighborhood had one or two soba establishments, many also serving sake, which functioned much like modern cafes where locals would stop for a casual meal. At that time, the population of Edo (Tokyo), being considerably wealthier than the rural poor, were more susceptible to beriberi due to their high consumption of white rice, which is low in thiamine. It was discovered that beriberi could be prevented by regularly eating thiamine-rich soba.
Some establishments, especially cheaper and more casual ones, may serve both soba and udon as they are often served in a similar manner. Soba is the traditional noodle of choice for Tokyoites.
Soba is typically eaten with chopsticks, and in Japan, it is considered acceptable to slurp the noodles noisily. This is especially common with hot noodles, as drawing up the noodles quickly into the mouth helps cool them. However, quiet consumption of noodles is no longer uncommon.
Like many Japanese noodles, soba noodles are often served drained and chilled in the summer, and hot in the winter with a soy-based dashi broth. Extra toppings can be added to both hot and cold soba. Toppings are chosen to reflect the seasons and to balance with other ingredients. Most toppings are added without much cooking, although some are deep-fried. Most of these dishes may also be prepared with udon.
Chilled soba is often served on a sieve-like bamboo tray called a zaru, sometimes garnished with bits of dried nori seaweed, with a dipping sauce known as soba tsuyu on the side. The tsuyu is made of a strong mixture of dashi, sweetened soy sauce (also called "sat?j?yu") and mirin. Using chopsticks, the diner picks up a small amount of soba from the tray and dips it in the cold tsuyu before eating it. Wasabi and scallions are often mixed into the tsuyu. Many people think that the best way to experience the unique texture of hand-made soba noodles is to eat them cold, since letting them soak in hot broth changes their consistency. After the noodles are eaten, many people enjoy drinking the water in which the noodles were cooked (sobayu ), mixed with the leftover tsuyu.
Soba is also often served as a noodle soup in a bowl of hot tsuyu. The hot tsuyu in this instance is thinner than that used as a dipping sauce for chilled soba. Popular garnishes are sliced long onion and shichimi t?garashi (mixed chili powder).
Soba is traditionally eaten on New Year's Eve in most areas of Japan, a tradition that survives to this day (Toshikoshi soba; English: from one year to another). In the Tokyo area, there is also a tradition of giving out soba to new neighbors after a house move (Hikkoshi soba), although this practice is now rare.
Soba contains a type of polysaccharide that is easily digested. Soba noodles also contain antioxidants, including rutin and quercetin, and essential nutrients including choline, thiamine and riboflavin.
Buckwheat is ready for harvest in three months, allowing four crops a year, mainly in spring, summer, and autumn. In Japan, buckwheat is produced mainly in Hokkaido. Soba that is made with newly harvested buckwheat is called "shin-soba". It is sweeter and more flavorful than regular soba.
Nagano Prefecture is famous for soba. The noodles are known as Shinshu Soba. One of the reasons for this popularity is that Nagano has natural features well-suited to soba production. The land has plenty of volcanic ash soil because of its highland location. It also has an extreme difference in temperatures. Many famous soba production centers can be found across the prefecture, from the Kurohime and Togakushi highlands in the north to the Kaida highlands in the south, and the prefecture boasts the second-highest production of soba in Japan. Many facilities are also engaged in integrated soba manufacturing, from cultivation to milling and cutting. Many of these facilities provide soba cutting courses for customers, forming one of the major leisure activities of Nagano.  Soba noodles are produced by mixing soba also known as buckwheat and regular flour, adding water, mixing, kneading, rolling and cutting. As a general rule, only noodles containing 40% or more soba flour can carry the Shinshu name. 
Soba is also the Japanese word for buckwheat. Roasted buckwheat kernels may be made into a grain tea called sobacha, which may be served hot or cold. Buckwheat hulls, or sobakawa (also called sobagara), are used to fill pillows. Sometimes, beers are made with roasted buckwheat added as a flavoring, and called "soba ale".
Soba is occasionally used to refer to noodles in general. In Japan, ramen is traditionally called ch?ka soba (?) or, before the end of the Second World War, shina soba (?). Both of these mean "Chinese noodles", though the word shina was replaced by ch?ka because the Chinese considered the former term offensive. Parboiled ch?ka soba is stir-fried to make yakisoba. The name ramen is the Japanese pronunciation of the Chinese lamian (). Note that these noodles do not contain buckwheat. In this context, 'soba' noodles proper are called nihon soba (?, 'Japanese soba') as opposed to ch?ka soba.
In Okinawa, soba usually refers to Okinawa soba, a completely different dish of noodles made out of flour, not buckwheat. Okinawa soba is also quite popular in the city of Campo Grande (Brazil), due to influence of Japanese (Okinawan) immigrants. It is eaten at street markets or in special restaurants called "sobarias".