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Citrus hystrix, called the kaffir lime, makrut lime (US: //; UK: //) or Mauritius papeda, is a citrus fruit native to tropical Asia, including India, Nepal, Bangladesh, Thailand, Indonesia, Malaysia, and the Philippines.
In South Africa, "kaffir" is an ethnic slur for black people. Consequently, some commentators favour switching from "kaffir lime" to "makrut lime", a name less well established in English. The Oxford Companion to Food is among these.
Citrus hystrix is a thorny bush, 6 to 35 feet (1.8 to 10.7 m) tall, with aromatic and distinctively shaped "double" leaves. These hourglass-shaped leaves comprise the leaf blade plus a flattened, leaf-like stalk (or petiole). The fruit is rough and green, and ripens to yellow; it is distinguished by its bumpy exterior and its small size, approximately 4 cm (2 in) wide.
The leaves are the most frequently used part of the plant, fresh, dried, or frozen. The leaves are widely used in Thai and Lao cuisine (for dishes such as tom yum) and Cambodian cuisine (for the base paste "krueng"). The leaves are used in Vietnamese cuisine to add fragrance to chicken dishes and to decrease the pungent odor when steaming snails. The leaves are used in Indonesian cuisine (especially Balinese cuisine and Javanese cuisine) for foods such as soto ayam and are used along with Indonesian bay leaf for chicken and fish. They are also found in Malaysian and Burmese cuisines. It is used widely in South Indian cuisine.
The rind (peel) is commonly used in Lao and Thai curry paste, adding an aromatic, astringent flavor. The zest of the fruit, referred to as combava, is used in creole cuisine to impart flavor in infused rums and rougails in Martinique, Réunion, and Madagascar. In Cambodia, the entire fruit is crystallized/candied for eating.
The juice and rinds of the peel are used in traditional medicine in some Asian countries; the fruit's juice is often used in shampoo and is believed to kill head lice.
The juice finds use as a cleanser for clothing and hair in Thailand and very occasionally in Cambodia. Lustral water mixed with slices of the fruit is used in religious ceremonies in Cambodia.
Citrus hystrix is grown worldwide in suitable climates as a garden shrub for home fruit production. It is well suited to container gardens and for large garden pots on patios, terraces, and in conservatories.
The compound responsible for the characteristic aroma was identified as (–)-(S)-citronellal, which is contained in the leaf oil up to 80%; minor components include citronellol (10%), nerol and limonene.
From a stereochemical point of view, it is remarkable that kaffir/makrut lime leaves contain only the (S) stereoisomer of citronellal, whereas its enantiomer, (+)-(R)-citronellal, is found in both lemon balm and (to a lesser degree) lemon grass, (however, citronellal is only a trace component in the latter's essential oil).
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