Coriander (Coriandrum sativum), also commonly called cilantro in North America, is an annual herb in the family Apiaceae. Coriander is native to southwestern Asia west to north Africa. It is a soft, hairless, foetid plant growing to 50 cm tall. The leaves are variable in shape, broadly lobed at the base of the plant, and slender and feathery higher on the flowering stems. The flowers are borne in small umbels, white or very pale pink, asymmetrical, with the petals pointing away from the centre of the umbel longer (5-6 mm) than those pointing to the middle of the umbel (only 1-3 mm long). The fruit is a globular dry schizocarp 3-5 mm diameter.
All parts of the plant are edible, but the fresh leaves and the dried seeds are the most commonly used in cooking.
The leaves are variously referred to as coriander leaves, cilantro (in the United States, from the Spanish name for the plant), dhania (in the Indian subcontinent, and increasingly, in Britain), Chinese parsley or Mexican parsley. The leaves have a very different taste from the seeds, similar to parsley but “juicier” and with citrus-like overtones. Some people instead perceive an unpleasant “soapy” taste and/or a rank smell. This perception is believed to be a result of an enzyme that changes the way they taste cilantro, a genetic trait, but has yet to be fully researched.
The fresh leaves are an essential ingredient in many Vietnamese foods, Asian chutneys, Mexican salsas and guacamole, and very tasty when used in sushi rolls. Chopped coriander leaves are also used as a garnish on cooked dishes such as dal and many curries. As heat diminishes their flavor quickly, coriander leaves are often used raw or added to the dish right before serving. (Though in some Indian and Central Asian recipes, coriander leaves are used in huge amounts and cooked till they dissolve into sauce and their flavor mellows.)
In Peruvian cuisine, the leaves are used in a great number of traditional recipes, and are known as “culantro.” The seeds have also recently been incorporated into newer recipes.
Coriander leaves were formerly common in European cuisine but nearly disappeared before the modern period. Today Europeans usually eat coriander leaves only in dishes that originated in foreign cuisines, except in Portugal, where it is still an essential ingredient in many traditional dishes.
The fresh coriander herb is best stored in the refrigerator in airtight containers, after chopping off the roots. The leaves do not keep well and should be eaten quickly, as they lose their aroma when dried or frozen.
The dry fruits are known as coriander seeds or coriandi seeds. In some regions, the use of the word coriander in food preparation always refers to these seeds (as a spice), rather than to the plant itself. The seeds have a lemony citrus flavor when crushed, due to the presence of the terpenes linalool and pinene. It is also described as warm, nutty, spicy, and orange-flavored. They are usually dried but can be eaten green.
If the spice is bought (or picked — it can be grown in a home garden) whole in a non-dried form, it can be dried in the sun. Most commonly, it is bought as whole dried seeds, but can also be purchased in ground form. When grinding at home, it can be roasted or heated on a dry pan briefly to enhance the aroma before grinding it in an electric grinder or with a mortar and pestle; ground coriander seeds lose their flavor quickly in storage and are best only ground as needed. For optimum flavor, whole coriander seed should be used within six months, or stored for no more than a year in a tightly sealed container away from sunlight and heat.
Coriander seed is a key spice (Hindi name: dhania) in garam masala and Indian curries, which often employ the ground fruits in generous amounts together with cumin. It also acts as a thickener. Roasted coriander seeds, called dhana dal, are also eaten as a snack. It is also the main ingredient of the two south Indian gravies: sambhar and rasam.
Outside of Asia, coriander seed is an important spice for sausages in Germany and South Africa (see boerewors). In Russia and Central Europe coriander seed is an occasional ingredient in rye bread as an alternative to caraway. Apart from the uses just noted, coriander seeds are rarely used in European cuisine today, though they were more important in former centuries.
Coriander seeds are also used in brewing certain styles of beer, particularly some Belgian wheat beers. The coriander seeds are typically used in conjunction with orange peel to add a citrus character to these styles of beer.
Coriander roots are used in a variety of Asian cuisine. They are commonly used in Thai dishes.
Coriander has been used as a folk medicine for the relief of anxiety and insomnia in Iranian folk medicine. Experiments in mice support its use as an anxiolytic.
Coriander essential oil showed a delay in E. Coli growth, suggesting possible agricultural anti-bacterial applications.
Coriander seeds have also been used to prepare a traditional diuretic in India . The diuretic is prepared by boiling equal amounts of coriander seeds and cumin seeds. The extract is then cooled and consumed as a diuretic.
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