Cashew
Cashews ready for harvest in Kollam, India
Scientific classification
Kingdom:	Plantae
(unranked):	Angiosperms
(unranked):	Eudicots
(unranked):	Rosids
Order:	Sapindales
Family:	Anacardiaceae
Genus:	Anacardium
Species:	A. occidentale
Binomial name
Anacardium occidentale L.

The cashew is a tree in the family Anacardiaceae. Its English name derives from the Portuguese name for the fruit of the cashew tree, caju, which in turn derives from the indigenous Tupi name, acajú. Originally native to northern South America, it is now widely grown in tropical climates for its cashew seeds and cashew apples.

  Etymology

The name Anacardium refers to the shape of the fruit, which looks like an inverted heart (ana means "upwards" and -cardium means "heart"). In the Tupian languages acajú means "nut that produces itself".^[1]

  Habitat and growth

  'Anacardium occidentale', from Koehler's 'Medicinal-Plants' (1887)

  Worldwide cashew yield

  Cashew tree

The tree is small and evergreen, growing to 10-12m (~32 ft) tall, with a short, often irregularly shaped trunk. The leaves are spirally arranged, leathery textured, elliptic to obovate, 4 to 22 cm long and 2 to 15 cm broad, with a smooth margin. The flowers are produced in a panicle or corymb up to 26 cm long, each flower small, pale green at first then turning reddish, with five slender, acute petals 7 to 15 mm long. The largest cashew tree in the world covers an area of about 7,500 square metres (81,000 sq ft).

The fruit of the cashew tree is an accessory fruit (sometimes called a pseudocarp or false fruit). What appears to be the fruit is an oval or pear-shaped structure, a hypocarpium, that develops from the pedicel and the receptacle of the cashew flower.^[2] Called the cashew apple, better known in Central America as "marañón", it ripens into a yellow and/or red structure about 5–11 cm long. It is edible, and has a strong "sweet" smell and a sweet taste. The pulp of the cashew apple is very juicy, but the skin is fragile, making it unsuitable for transport. In Latin America, a fruit drink is made from the cashew apple pulp which has a very refreshing taste and tropical flavor that can be described as having notes of mango, raw green pepper, and just a little hint of grapefruit-like citrus.

The true fruit of the cashew tree is a kidney or boxing-glove shaped drupe that grows at the end of the cashew apple. The drupe develops first on the tree, and then the pedicel expands to become the cashew apple. Within the true fruit is a single seed, the cashew nut. Although a nut in the culinary sense, in the botanical sense the nut of the cashew is a seed. The seed is surrounded by a double shell containing an allergenic phenolic resin, anacardic acid, a potent skin irritant chemically related to the more well known allergenic oil urushiol which is also a toxin found in the related poison ivy. Properly roasting cashews destroys the toxin, but it must be done outdoors as the smoke (not unlike that from burning poison ivy) contains urushiol droplets which can cause severe, sometimes life-threatening, reactions by irritating the lungs. People who are allergic to cashew urushiols may also react to mango or pistachio which are also in the Anacardiaceae family. Some people are allergic to cashew nuts, but cashews are a less frequent allergen than nuts or peanuts.^[3]

  Dispersal

While native to Northern South America, the Portuguese took the cashew plant to Goa, India, between the years of 1560 and 1565. From there it spread throughout Southeast Asia and eventually Africa.^[4] The Portuguese came to India to get cashews roasted and then trade them in different parts of world because the Indians had mastered the art of roasting cashews.

  Production

The top 10 Cashew nuts (with shell) production countries in 2010 according to FAO in tonnes

1.  Viet Nam 1,159,600
2.  India 613,000
3.  Nigeria 594,000
4.  Côte d'Ivoire 370,000
5.  Indonesia 174,300
6.  Philippines 134,681
7.  Brazil 102,002
8.  Guinea-Bissau 91,100
9.  Benin 69,700
10.  Mozambique 67,200

  Uses

  Medicine and industry

  Cashew nuts, salted

The cashew nutshell liquid (CNSL), a byproduct of processing cashew, is mostly composed of anacardic acids^[5] (70%), cardol (18%) and cardanol (5%).^[6] These acids have been used effectively against tooth abscesses due to their lethality to a wide range of Gram-positive bacteria.^[7] Many parts of the plant are used by the Patamona of Guyana medicinally. The bark is scraped and soaked overnight or boiled as an antidiarrheal;^[7] it also yields a gum used in varnish. Seeds are ground into powders used for antivenom for snake bites.^[7] The nut oil is used topically as an antifungal and for healing cracked heels.^[7]

Anacardic acid is also used in the chemical industry for the production of cardanol, which is used for resins, coatings, and frictional materials.^[5][6]

  Culinary

  Cashew nuts, roasted and salted

The cashew nut is a popular snack, and its rich flavor means that it is often eaten roasted, on its own, lightly salted or sugared, or covered in chocolate.

Cashew is very commonly used in Indian cuisine. The nut can be used whole for garnishing sweets or curries, or ground into a paste that forms a base of sauces for curries (eg.Korma), or some sweets. It is also used in powdered form in the preparation of several Indian sweets and desserts. In Goan cuisine both roasted and raw kernels are used whole for making curries and sweets. The cashew apple is eaten raw or used in curries.

The cashew nut can also be harvested in its tender form, when the shell has not hardened and is green in color. The shell is soft and can be cut with a knife and the kernel extracted, but it is still corrosive at this stage, so gloves are required. The kernel can be soaked in turmeric water to get rid of the corrosive material before use. This is mostly found in Kerala cuisine, typically in avial, a dish that contains several vegetables, grated coconut, turmeric and green chilies.

Cashew nuts also appear in Thai and Chinese cuisine, generally in whole form.

In Malaysia, the young leaves are eaten raw in a salad or with Sambal belacan (shrimp paste with chili and lime).

In Brazil, the cashew fruit juice is popular all across the country.

In Panama, the cashew fruit is cooked with water and sugar for a prolonged period of time to make a sweet, brown, paste-like dessert called "dulce de marañón". Marañón is one of the Spanish names for cashew.

In the Philippines, cashew is a known product of Antipolo, and is eaten with suman. Pampanga also has a sweet dessert called turrones de casuy which is cashew marzipan wrapped in white wafer.

In Indonesia, roasted and salted cashew nut is called kacang mete or kacang mede, while the cashew apple is called jambu monyet (literally means monkey rose apple).

  Alcohol

In Goa, India, the cashew apple (the accessory fruit) is mashed, the juice is extracted and kept for fermentation for 2–3 days. Fermented juice then undergoes a double distillation process. The resulting beverage is called feni. Fenny/feni is about 40-42% alcohol. The single distilled version is called "Urrac" (the 'u' is pronounced ~ 'oo') which is about 15% alcohol.

In the southern region of Mtwara, Tanzania, the cashew apple (bibo in Swahili) is dried and saved. Later it is reconstituted with water and fermented, then distilled to make a strong liquor often referred to by the generic name, gongo.

In Mozambique, it is very common among the cashew farmers to make a strong liquor from the cashew apple which is called "agua ardente" (burning water).

According to An Account of the Island of Ceylon written by Robert Percival^[8] an alcohol had been distilled in the early twentieth century from the juice of the fruit, and had been manufactured in the West Indies. Apparently the Dutch considered it superior to brandy as a "liqueur."

  Nutrition

The fats and oils in cashew nuts are 54% monounsaturated fat (18:1), 18% polyunsaturated fat (18:2), and 16% saturated fat (9% palmitic acid (16:0) and 7% stearic acid (18:0)).^[9]

  See also

• Wild Cashew - the species Anacardium excelsum.
• Semecarpus anacardium, (the Oriental Anacardium) is a native of India and is closely related to the cashew.
• List of culinary nuts
• Cajuina

  Further reading

• Morton, Julia F. Fruits of Warm Temperatures. ISBN 978-0-9610184-1-2 [2]. Cashew Apple. p. 239–240.[3]
• Pillai, Rajmohan and Santha, P. The World Cashew Industry (Rajan Pillai Foundation, Kollam, 2008).nm.

  References

  External links

Wikimedia Commons has media related to: Anacardium occidentale

• Handbook of Energy Crops - Anacardium occidentale L.