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Fermented bean curd

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Chinese  豆腐乳
Hanyu Pinyin  dòufurǔ
Romanization  teu fu nen
Literal meaning  bean curd cream
Wade–Giles  tou-fu-ju
Yale Romanization  dauh fuh yúh
Fermented bean curd Fermented bean curd Wikipedia
Similar  Water, Tofu, Douchi, Stinky tofu, Water spinach

Fermented tofu (also called fermented bean curd, tofu cheese, soy cheese or preserved tofu) is a form of processed, preserved tofu used in East Asian cuisine as a condiment. The ingredients typically are soybeans, salt, rice wine and sesame oil or vinegar. In mainland China the product is often freshly distributed. In overseas Chinese communities and Southeast Asia commercially packaged versions are often sold in jars containing blocks 2- to 4-cm square by 1 to 2 cm thick soaked in brine with select flavorings.

Contents

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History

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According to Compendium of Materia Medica (Pen-tsao Kang-mu or Bencao Gangmu), by Li Shizhen (1596), the creation of soybean curd is attributed to Liu An (179 – 122 BC), king of Huainan. Manufacture spread began during the Han Dynasty in China after it was created. The date when the preservation of this curd began is unknown, but most likely was derived from those wishing to preserve the curd that had appeared to have gone bad.

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The Food Encyclopedia, written by Wang Su-Hsiung (1861) of Qing Dynasty, made reference to preserved bean curd as superior to difficult-to-digest, hardened tofu especially for the elderly, children and ill persons.

Names

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In Mandarin, the product is generally known as dòufǔrǔ (豆腐乳), "dòurǔ" (豆乳) or fǔrǔ (腐乳) — though in southwest China it is often known as lǔfǔ (卤腐). In English it is sometimes referred to as "soy cheese".

Characteristics

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Fermented bean curd has a special mouthfeel similar to certain dairy products due to the breakdown of its proteins which takes place during the air drying and fermentation. Lacking strong flavor, fermented bean curd takes on the aroma and taste of its soaking liquid. The flavor is salty with mild sweetness. The texture and taste of fermented bean curd resembles a firm, smooth paste not unlike creamy blue cheese. (Indeed, this kind of tofu is sometimes called "Chinese cheese" in English). Refrigerated, it can be kept for several years, during which time its flavor is believed to improve.

Culinary use

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Fermented tofu is commonly used as a condiment, combined in to sauces to accompany hot pot, or consumed at breakfast to flavor rice, porridge, gruel, congee, or erkuai. Usually either several bricks are placed in a small bowl covered in the flavored brine or one to one half bricks are placed into a bowl. Then, chunks are broken off the brick and consumed with a mouthful of porridge or gruel. The brine may also be used for flavoring. Fermented bean curd can also be added in small amounts, together with its brine, to flavor stir-fried or braised vegetable dishes (particularly leafy green vegetables such as water spinach).

Comparison with cheese

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Both tofu and cheese are made from curds obtained from the coagulation of soy milk and dairy milk respectively. However, soybean curds are formed from the chemical destabilization of the micelles (using calcium sulfate, magnesium sulfate, etc.) allowing protein bonding while cheese curds are created from the enzymatic (rennet) hydrolysis of casein into para-casin. The bean curds are then simply pressed to produce tofu and thus bland and highly perishable, like unaged cheese, while fermented bean curd, like aged cheese, is ripened with microorganisms and thus flavorful and long-lasting.

Varieties

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White (bái) preserved bean curd (fǔrǔ) is the most common type and can be described without the white adjective. The flavor, color and aroma can be altered using various combinations of spices and seasoning in the brine with alterations in the commonly used combination of 10% rice wine and 12% salt. Those with no alcohol produces "small cheese cubes" (hih-fang) while those with double the alcohol content produces "drunken cheese" (tsui-fang). This variety is also available with chili and/or sesame oil. Seasonings can include anise, cinnamon, lemon juice, lemon zest, dried shrimp, and ham. In addition, one can also obtain the curd dried, and without brine, which are then sold in paper cartons.

Red fermented bean curd (Chinese: 紅腐乳/南乳; pinyin: hóngfǔrǔ/nánrǔ; Wade–Giles: hung2-fu3-ju3/nan2-ju3), incorporates red yeast rice (cultivated with Monascus purpureus) with the brining liquor for a deep-red color and distinctively thickened flavor and aroma. This variety may also contain chili. A popular derivative of this variety has an appearance of ketchup and is seasoned with rose wine, caramel and natural sugar.

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Stinky fermented bean curd is fermented for over six months and is also popular due to its strong creamy flavor. However due to its strong acrid smell, this variety is an acquired taste. Note that stinky sufu differs from stinky tofu in appearance, consistency and salt content. Stinky sufu are made in the same cube-like shapes and has a similar smooth soft creamy texture as regular white sufu. In Taiwan, a green version is popular and made with sake lees, crushed leaves and a green mucor mold. It is then fermented for 12 hours and sold on the streets.

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Chiang fermented bean curd (Chiang-doufu) is made with cubes of tofu soaked in either Chinese-style miso (Chiang) or soy sauce for several days. Usually reddish-brown in color and salty, it may be dried and fermented further and may also be mixed with sake lees. In Japan, miso is used.

Production

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In order to produce fermented bean curd, cubes of dried tofu are allowed to fully air-dry under hay and slowly ferment from aerial bacteria and fungal spores. Commercially available fermented bean curd is made by using dry firm tofu that has been inoculated with the fungal spores of Actinomucor elegans, Mucor sufu, Mucor rouxanus, Mucor wutuongkiao, Mucor racemosus, or Rhizopus spp.. This freshly fermented tofu is known as mold tofu" (霉豆腐).

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The dry fermented tofu is then soaked in brine, typically enhanced with Chinese rice wine, vinegar, chili peppers or sesame oil, or a paste made of rice and soybeans. In the case of red fermented bean curd (Chinese: 紅腐乳/南乳; pinyin: hóngfǔrǔ/nánrǔ), red yeast rice (cultivated with Monascus purpureus) is added for color. Fermented bean curd is generally sold in small glass jars.

References

Fermented bean curd Wikipedia


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