2008年11月28日星期五

Sesame oil



Sesame oil (also known as gingelly oil or til oil) is an edible vegetable oil derived from sesame seeds. Besides being used as a cooking oil in South India, it is often used as a flavor enhancer in Chinese, Taiwanese, Korean, and to a lesser extent, Southeast Asian cuisine.

History
Sesame seeds were one of the first crops processed for oil as well as one of the earliest condiments. In fact, the word ennai that means oil in Tamil has its roots in the Tamil words eL and nei, which mean sesame and fat.
Prior to 600 BC, the Assyrians used sesame oil as a food, salve, and medication, primarily by the rich, as the difficulty of obtaining it made it expensive. Hindus use til oil in votive lamps, and consider the oil sacred. According to Hindu belief, lighting lamp filled with til oil in front of Lord Hanuman removes obstacles and difficulties in life.
Nomenclature
In the Tamil language of India, Sesame Oil is called "Nalla Ennai",which literal translation in English is "good oil". In the Telugu language of India, Sesame Oil is called "Nuvvula Noone" (Nuvvulu means sesame and Noone means cooking oil) or "Manchi Noone" (Manchi means good and Noone means cooking oil). In the Kannada language of India, Sesame Oil is called "yellenne" (from "yellu" for sesame). It is also called as Gingelly Oil in India.

Manufacture of sesame oil
Manufacturing process

Making sesame oil at Moran Market, Seongnam, Gyeonggi Province, South Korea.
The extraction of sesame oil from the sesame seed is not a completely automated process. In the fairy tale “Ali Baba and the Forty Thieves” the sesame fruit serves as a symbol for wealth. When the fruit capsule opens, it releases a real treasure - the sesame seeds. However, a great deal of manual work is necessary before this point is reached. That is why sesame is hardly ever cultivated in Western industrialised agricultural areas.
The sesame seeds are protected by a capsule, which does not burst open until the seeds are completely ripe. The ripening time tends to vary. For this reason, the farmers cut plants by hand and place them together in upright position to carry on ripening for a few days. The seeds are only shaken out onto a cloth after all the capsules have opened.
The discovery of an indehiscent (nonshattering) mutant by Langham in 1943 began the work towards development of a high yielding, shatter-resistant variety. Although researchers have made significant progress in sesame breeding, harvest losses due to shattering continue to limit Sesame seed market
As of 2007, sesame is being imported into the US at a price of US$0.43/lb. This relatively high price reflects a world-wide shortage. Though the market for sesame seed is strong, domestic US production awaits the development of high-yielding nonshattering varieties. It is advisable to establish a market before planting.
Varieties
There are many variations in the colour of sesame oil: cold-pressed sesame oil is almost colourless, while Indian sesame oil (gingelly or til oil) is golden and Chinese sesame oil is commonly a dark brown colour.
East Asian sesame oil derives its dark colour and flavour from toasted hulled sesame seeds. Cold pressed sesame oil has less flavour than the toasted oil, since it is produced directly from raw, rather than toasted seeds.
Sesame oil is traded in any of the forms described above: Cold-pressed sesame oil is available in Western health shops. In most Asian countries, different kinds of hot-pressed sesame oil are preferred.

Uses

Cooking
In spite of the fact that, sesame oil contains high proportion(41%) of polyunsaturated (Omega-6 fatty acids) it is least prone, among cooking oils - with high smoke points -, to turn rancid (when kept in the open).This is due to the natural antioxidants present in the oil. Because of this, it carries a premium relative to other cooking oils.
Light sesame oil has a high smoke point, and is suitable for frying, while heavy (dark) sesame oil


没有评论: