Okara | |||||||||||||||||||||
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Chinese name | |||||||||||||||||||||
Chinese | 豆渣/ 豆腐渣 | ||||||||||||||||||||
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Japanese name | |||||||||||||||||||||
Kanji | 雪花菜/ 御殻 | ||||||||||||||||||||
Kana | おから | ||||||||||||||||||||
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Korean name | |||||||||||||||||||||
Hangul | 비지/ 콩비지 | ||||||||||||||||||||
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Okara,soy pulp,or tofu dregs is a pulp consisting of insoluble parts of the soybean that remain after pureed soybeans are filtered in the production of soy milk and tofu. It is generally white or yellowish in color. It is part of the traditional cuisines of Japan,Korea,and China. Since the 20th century,it has been used in the vegetarian cuisines of Western nations.
It is called dòuzhā or dòufuzhā in Chinese,okara in Japanese,and biji or kongbiji in Korean.
Okara is the oldest of three basic types of soy fiber. The other two are soy bran (finely ground soybean hulls) and soy cotyledon/isolate fiber (the fiber that remains after making isolated soy protein,also called "soy protein isolate").
Okara is a food by-product from tofu and soy drink production. [1] : 9 In 1983 it was estimated that the annual yield for okara in Japan was approximately 70,000 metric tons. [2] : 380
Due to its high moisture and nutrient content,okara is highly prone to putrefaction, [2] : 380 and this has limited its commercial use. [3] : 5
Okara that is firmly packed consists of 3.5 to 4.0% protein,76 to 80% moisture and 20 to 24% of solids. When moisture free,the gritty okara contains 8 to 15% fats,12 to 14.5% crude fiber and 24% protein,and contains 17% of the protein from the source soybeans. It also contains potassium,calcium,niacin. [1] : 151 [4] : 168 [?] Most of the soybean isoflavones are left in okara,as well as vitamin B and the fat-soluble nutritional factors,which include soy lecithin,linoleic acid,linolenic acid,phytosterols,tocopherol,and vitamin D. [5]
Okara contains some antinutritional factors:trypsin inhibitors (mostly destroyed by cooking),saponins,and soybean agglutinins,which cannot be easily digested.
Fermentation (by proper species of bacteria) of okara is conducive to digestion and absorption of okara nutrients,and it further improves the nutritional value. It can eliminate the bean's odor,increase the amount of edible fiber,free amino acids,sugars,fatty acids,vitamin B12,vitamin B2,and flavoprotein. [5]
Most okara worldwide is used as feed for livestock —especially hogs and dairy cows. Most of the rest is used as a natural fertilizer or compost,which is fairly rich in nitrogen. A small amount is used in cookery. [3] : 3–4
In Japan it is used in a side dish called unohana which consists of okara cooked with soy sauce,mirin,sliced carrots,burdock root and shiitake mushrooms. [6]
Okara can be used to make tempeh,by fermenting with the fungus Rhizopus oligosporus, [4] : 168 using a tempeh starter. [7] It can make press cake tempeh using ingredients such as brown rice,bulgur wheat,soybeans and other legume and grain combinations. [8] Okara is also eaten as red oncom by the Sundanese people on Java in Indonesia after fermentation by Neurospora. [9]
Okara is eaten in the Shandong cuisine of eastern China by steaming a wet mixture of okara that has been formed into blocks of zha doufu (also known as xiao doufu or cai doufu). [10] : 172
The product is sometimes used as an ingredient in vegetarian burger patties. Additional uses include processing into a granola product,as an ingredient in soysage,as an egg replacement in vegan quiche,and as an ingredient in pâtés. [4] : 168
In Japan,there have been experiments with incorporating okara into ice cream. [11]
Most okara is used as animal feed,especially for farms in vicinity of soy milk or tofu factories. [3] [4] : 168
The product is used as an ingredient in pet foods. [4] : 168
Okara is sometimes spread on fields as a natural nitrogen fertilizer. It adds tilth to the soil. Likewise,it can be added to compost to add organic nutrients and nitrogen. [4] : 168
When not considered foodstuff,it may be deemed 'soybean curd residue' (SCR). Some 800,000 tons of soybean curd residue is disposed annually as tofu production byproducts in Japan. As mass waste,it is a potential environmental problem because it is highly susceptible to putrefaction. [5]
The protein in SCR is of better quality than from other soy products;for example,the protein efficiency ratio of SCR is 2.71 compared with 2.11 for soymilk. The ratio of essential amino acids to total amino acids is similar to tofu and soymilk. [5] Nevertheless,it remains a challenge to current processes to commercially extract the proteins and nutrients from SCR waste.
Miso is a traditional Japanese seasoning. It is a thick paste produced by fermenting soybeans with salt and kōji and sometimes rice,barley,seaweed,or other ingredients. It is used for sauces and spreads,pickling vegetables,fish,or meats,and mixing with dashi soup stock to serve as miso soup,a Japanese culinary staple. Miso is high in protein and rich in vitamins and minerals,and it played an important nutritional role in feudal Japan. Miso is still widely used in both traditional and modern cooking in Japan and has been gaining worldwide interest.
Vegetarian cuisine is based on food that meets vegetarian standards by not including meat and animal tissue products.
The soybean,soy bean,or soya bean is a species of legume native to East Asia,widely grown for its edible bean,which has numerous uses.
Tempeh or tempe is a traditional Indonesian food made from fermented soybeans. It is made by a natural culturing and controlled fermentation process that binds soybeans into a cake form. A fungus,Rhizopus oligosporus or Rhizopus oryzae,is used in the fermentation process and is also known as tempeh starter.
Nattō is a traditional Japanese food made from whole soybeans that have been fermented with Bacillus subtilis var. natto. It is often served as a breakfast food with rice. It is served with karashi mustard,soy or tare sauce,and sometimes Japanese bunching onion. Within Japan,nattō is most popular in the eastern regions,including Kantō,Tōhoku,and Hokkaido.
Soy milk,also known as soya milk or soymilk,is a plant-based drink produced by soaking and grinding soybeans,boiling the mixture,and filtering out remaining particulates. It is a stable emulsion of oil,water,and protein. Its original form is an intermediate product of the manufacture of tofu. Originating in China,it became a common beverage in Europe and North America in the latter half of the 20th century,especially as production techniques were developed to give it a taste and consistency more closely resembling that of dairy milk. Soy milk may be used as a substitute for dairy milk by individuals who are vegan or lactose intolerant.
Tofu skin,yuba,beancurd skin,beancurd sheet,or beancurd robes is a food item made from soybeans. During the boiling of soy milk,in an open shallow pan,a film or skin composed primarily of a soy protein-lipid complex forms on the liquid surface. The films are collected and dried into yellowish sheets known as tofu skin. Since tofu skin is not produced using a coagulant,it is not technically a proper tofu;however,it does have a similar texture and flavor to some tofu products.
Fermented tofu is a Chinese condiment consisting of a form of processed,preserved tofu used in East Asian cuisine. 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 living in 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.
A milk substitute is any substance that resembles milk and can be used in the same ways as milk. Such substances may be variously known as non-dairy beverage,nut milk,grain milk,legume milk,mock milk and alternative milk.
In food processing,fermentation is the conversion of carbohydrates to alcohol or organic acids using microorganisms—yeasts or bacteria—without an oxidizing agent being used in the reaction. Fermentation usually implies that the action of microorganisms is desired. The science of fermentation is known as zymology or zymurgy.
Oncom is one of the traditional staple foods of the Sundanese cuisine of Indonesia. There are two kinds of oncom:red oncom and black oncom. Oncom is closely related to tempeh;both are foods fermented using mold.
Soy protein is a protein that is isolated from soybean. It is made from soybean meal that has been dehulled and defatted. Dehulled and defatted soybeans are processed into three kinds of high protein commercial products:soy flour,concentrates,and isolates. Soy protein isolate has been used since 1959 in foods for its functional properties.
Tofu is a food prepared by coagulating soy milk and then pressing the resulting curds into solid white blocks of varying softness:silken,soft,firm,extra firm. Tofu is also known as bean curd in English. Tofu originated in China and has been consumed in the country for over 2,000 years. Tofu is a traditional component of many East Asian and Southeast Asian cuisines. In modern Western cooking,it is often used as a meat substitute.
Sundanese cuisine is the cuisine of the Sundanese people of Western Java,and Banten,Indonesia. It is one of the most popular foods in Indonesia. Sundanese food is characterised by its freshness;the famous lalab eaten with sambal and also karedok demonstrate the Sundanese fondness for fresh raw vegetables. Unlike the rich and spicy taste,infused with coconut milk and curry of Minangkabau cuisine,the Sundanese cuisine displays the simple and clear taste;ranged from savoury salty,fresh sourness,mild sweetness,to hot and spicy.
Tauge goreng is an Indonesian savoury vegetarian dish made of stir-fried tauge with slices of tofu,ketupat or lontong rice cake and yellow noodles,served in a spicy oncom-based sauce. Tauge goreng is a specialty of Jakarta and Bogor city,West Java,Indonesia. It is usually sold as street food using pikulan or gerobak (cart) by street vendors. It is a popular street food in Indonesia,especially in Jakarta,and Greater Jakarta areas,including Bogor,Depok,Tangerang and Bekasi.
William Roy Shurtleff also known as Bill Shurtleff is an American researcher and writer about soy foods. Shurtleff and his former wife Akiko Aoyagi have written and published consumer-oriented cookbooks,handbooks for small- and large-scale commercial production,histories,and bibliographies of various soy foods. These books introduced soy foods such as tofu,tempeh,and miso on a wide scale to non-Asian Westerners,and are largely responsible for the establishment of non-Asian soy food manufacturers in the West beginning in the late 1970s. In 1980,Lorna Sass wrote in The New York Times,"The two people most responsible for catapulting tofu from the wok into the frying pan are William Shurtleff and Akiko Aoyagi.”In 1995,Suzanne Hamlin wrote in The New York Times,“At the turn of the century there were two tofu suppliers in the United States. Today there are more than 200 tofu manufacturers...and tofu can be found in nearly every supermarket."