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Tofu

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Tofu, also known as bean curd, is a versatile food made from the curds of coagulated soy milk.

Soft tofu 2
Soft tofu 2

It is produced by pressing these curds into solid white blocks. These blocks can vary in texture, ranging from silken and soft to firm and extra firm.

Tofu 4
Tofu 4

Tofu is a vital staple in many East Asian and Southeast Asian cuisines. In modern Western cooking, it is frequently used as a meat substitute. Nutritionally, tofu is a rich source of protein while remaining low in calories. It is also an environmentally friendly choice. Cultivating tofu requires only 1.3 m2 of land per 1000 kcal. Furthermore, it emits only 1.6 kg of greenhouse gas per 100 g of edible protein.

The production of tofu follows a specific sequence of steps. First, the soybeans are cleaned and soaked in water. Next, the beans are ground with water to create a slurry. This slurry is then filtered and boiled to prepare the soy milk. The most critical stage is coagulation, where the proteins and oils in the boiled milk form aggregates.

Tofu mould
Tofu mould

This happens because coagulants neutralize the negative charges on the soybean proteins. Once the milk turns into solid curds, known as douhua, the curds are pressed into cakes. Some varieties, like Japanese raw silken tofu, skip the pressing step entirely to remain very soft.

Different coagulants create distinct types of tofu. Calcium sulfate, also called gypsum, is the most traditional and common coagulant for Chinese-style tofu.

Sun-dubu
Sun-dubu

Because gypsum has low solubility, it creates a smooth, gelatinous tofu with a high water content. This method also makes the tofu rich in dietary calcium. Another option is using chloride-type nigari salts, or lushui. In Japan, nigari is a white powder made from seawater by removing sodium chloride and evaporating the water.

DouFu Gan
DouFu Gan

While the name comes from the Japanese word for "bitter," nigari imparts very little taste. Finally, acid coagulants like glucono delta-lactone (GDL) can be used. GDL is an organic acid derived from glucose. It produces a jelly-like, fine-textured tofu often used for silken varieties.

Tofu has a history spanning over 2,000 years. It originated in China, and some legends credit its invention to Prince Liu An of Anhui province.

Tofu knife
Tofu knife

While this legend is popular, scholars note that reliable records from that era are scarce. One theory suggests tofu was discovered accidentally when boiled soybeans mixed with impure sea salt. This salt likely contained calcium and magnesium, which caused the milk to curdle. Another theory suggests ancient Chinese people learned curdling by watching Mongolian milk production. During the Ming dynasty, the scholar Li Shizhen documented tofu methods in his Compendium of Materia Medica.

As Buddhism spread through Asia, tofu became even more significant. It provided an essential protein source for vegetarian diets. Tofu was introduced to Japan during the Nara period, appearing in records by 965 AD. In Japan, it was initially served as an offering at shrines. Over time, production evolved from hard varieties to modern smooth silken tofu.

Soft tofu 2
Soft tofu 2

In Southeast Asia, Chinese immigrants from Fujian province helped spread tofu. In Indonesia, it is called tahu and used in dishes like tahu goreng. In the Philippines, it is a breakfast staple called tahô or a meat alternative called tokwa.

Western contact with tofu began much later. Benjamin Franklin was among the first Americans to mention it. In a 1770 letter, he described it as "cheese" from China. The word "tofu" in English likely comes from the Japanese term, which was borrowed from the Chinese word dòufǔ. The first tofu company in the United States was established in 1878. Later, in 1908, Li Yuying opened the world's first soy dairy in France. However, tofu did not become mainstream in the West until the mid-20th century. It was popularized in the United States by William Shurtleff and Akiko Aoyagi.

Tofu production is chemically similar to making dairy cheese. Both processes involve coagulating milk to form curds and then pressing them. This connection highlights how different cultures use similar scientific principles to create food. Whether it is used in a spicy curry or a soft breakfast snack, tofu remains a global culinary icon. Its ability to take on different textures and flavors makes it a unique subject of both science and art.

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🖼️ Images & Media (13)
File:TofuSeller1500.jpg
TofuSeller1500.jpg
File:Tofu mould.jpg
Tofu mould.jpg
File:Tofu knife.jpg
Tofu knife.jpg
File:Sun-dubu.jpg
Sun-dubu.jpg
File:Soft tofu 2.jpg
Soft tofu 2.jpg
File:Tofu 4.jpg
Tofu 4.jpg
File:DouFu Gan.JPG
DouFu Gan.JPG
File:Thousand_leaves_tofu.jpg
Thousand_leaves_tofu.jpg
File:Fermentedchilibeancurd.jpg
Fermentedchilibeancurd.jpg
File:Dong Dou Fu (tofu).jpg
Dong Dou Fu (tofu).jpg
File:Koya-dofu (2012.07.31).jpg
Koya-dofu (2012.07.31).jpg
File:Tofu skin.jpg
Tofu skin.jpg

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