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Nutmeg (also known as pala in Indonesia) is one of the two spices – the other being mace – derived from several species of tree in the genus Myristica. The most important commercial species is Myristica fragrans, an evergreen tree indigenous to the Banda Islands in the Moluccas (or Spice Islands) of Indonesia.
Nutmeg is the seed of the tree, roughly egg-shaped and about 20 to 30 mm (0.8 to 1.2 in) long and 15 to 18 mm (0.6 to 0.7 in) wide, and weighing between 5 and 10 g (0.2 and 0.4 oz) dried, while mace is the dried "lacy" reddish covering or aril of the seed. The first harvest of nutmeg trees takes place 7–9 years after planting, and the trees reach full production after twenty years. Nutmeg is usually used in powdered form. This is the only tropical fruit that is the source of two different spices, obtained from different parts of the plant. Several other commercial products are also produced from the trees, including essential oils, extracted oleoresins, and nutmeg butter.
Botany and cultivation
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The common or fragrant nutmeg, Myristica fragrans, is native to the Banda Islands in the Moluccas, Indonesia. It is also cultivated on Penang Island in Malaysia, in the Caribbean, especially in Grenada, and in Kerala, a state formerly known as Malabar in ancient writings as the hub of spice trading, in southern India. Other species used to adulterate the spice include Papuan nutmeg M. argentea from New Guinea, and M. malabarica from India. In the 17th-century work Hortus Botanicus Malabaricus, Hendrik van Rheede records that Indians learned the usage of nutmeg from the Indonesians through ancient trade routes.
Nutmeg trees are dioecious plants which are propagated sexually and asexually, the latter being the standard. Sexual propagation by seedling yields 50% male seedlings, which are unproductive. As there is no reliable method of determining plant sex before flowering in the sixth to eighth year, and sexual propagation bears inconsistent yields, grafting is the preferred method of propagation. Epicotyl grafting, approach grafting, and patch budding have proved successful, with epicotyl grafting being the most widely adopted standard. Air-layering, or marcotting, is an alternative though not preferred method because of its low (35-40%) success rate.
Nutmeg and mace have similar sensory qualities, with nutmeg having a slightly sweeter and mace a more delicate flavour. Mace is often preferred in light dishes for the bright orange, saffron-like hue it imparts. Nutmeg is used for flavouring many dishes, usually in ground or grated form, and is best grated fresh in a nutmeg grater.
In Indonesian cuisine, nutmeg is used in various dishes, mainly in many spicy soups, such as some variant of soto, konro, oxtail soup, sup iga (ribs soup), bakso and sup kambing. It is also used in gravy for meat dishes, such as semur beef stew, ribs with tomato, to European derived dishes such as bistik (beef steak), rolade (minced meat roll) and bistik lidah (beef tongue steak). Sliced nutmeg fruit flesh could be made as manisan (sweets), either wet, which is seasoned in sugary syrup liquid, or dry coated with sugar.
In Penang cuisine, dried, shredded nutmeg rind with sugar coating is used as toppings on the uniquely Penang ais kacang. Nutmeg rind is also blended (creating a fresh, green, tangy taste and white colour juice) or boiled (resulting in a much sweeter and brown juice) to make iced nutmeg juice.
In Indian cuisine, nutmeg is used in many sweet, as well as savoury, dishes (predominantly in Mughlai cuisine). In Kerala Malabar region, it is considered medicinal and the flesh made into juice, pickles and chutney, while the grated nutmeg is used in meat preparations and also sparingly added to desserts for the flavour. It is also added in small quantities as a medicine for infants. It may also be used in small quantities in garam masala. Ground nutmeg is also smoked in India.
In Middle Eastern cuisine, ground nutmeg is often used as a spice for savoury dishes.
In traditional European cuisine, nutmeg and mace are used especially in potato dishes and in processed meat products; they are also used in soups, sauces, and baked goods. It is also commonly used in rice pudding. In Dutch cuisine, nutmeg is added to vegetables such as Brussels sprouts, cauliflower, and string beans. Nutmeg is a traditional ingredient in mulled cider, mulled wine, and eggnog. In Scotland, mace and nutmeg are usually both essential ingredients in haggis.
The essential oil obtained by steam distillation of ground nutmeg is used widely in the perfumery and pharmaceutical industries. This volatile fraction typically contains 60-80% d-camphene by weight, as well as quantities of d-pinene, limonene, d-borneol, l-terpineol, geraniol, safrol, and myristicin. In its pure form, myristicin is a toxin, and consumption of excessive amounts of nutmeg can result in myristicin poisoning. The oil is colourless or light yellow, and smells and tastes of nutmeg. It contains numerous components of interest to the oleochemical industry, and is used as a natural food flavouring in baked goods, syrups, beverages, and sweets. It is used to replace ground nutmeg, as it leaves no particles in the food. The essential oil is also used in the cosmetic and pharmaceutical industries, for instance, in toothpaste, and as a major ingredient in some cough syrups. In traditional medicine, nutmeg and nutmeg oil were used for disorders related to the nervous and digestive systems.
After extraction of the essential oil, the remaining seed, containing much less flavour, is called "spent". Spent is often mixed in industrial mills with pure nutmeg to facilitate the milling process, as nutmeg is not easy to mill due to the high percentage of oil in the pure seed. Ground nutmeg with a variable percentage of spent (around 10% w/w) is also less likely to clot. To obtain a better running powder, a small percentage of rice flour also can be added.
Nutmeg butter is obtained from the nut by expression. It is semisolid, reddish-brown in colour, and tastes and smells of nutmeg. About 75% (by weight) of nutmeg butter is trimyristin, which can be turned into myristic acid, a 14-carbon fatty acid, which can be used as a replacement for cocoa butter, can be mixed with other fats like cottonseed oil or palm oil, and has applications as an industrial lubricant.
Nutmeg is known to have been a prized and costly spice in European medieval cuisine as a flavouring, medicinal, and preservative agent. Saint Theodore the Studite (c. 758 – 826) allowed his monks to sprinkle nutmeg on their pease pudding when required to eat it. In Elizabethan times, because nutmeg was believed to ward off the plague, demand increased and its price skyrocketed.
Until the mid-19th century, the small island of Banda (known to early English adventurers as "Run" although it is a different island—both are now part of the Banda Islands southeast of Java), was the world's only source of nutmeg and mace. Nutmeg was known as a valuable commodity by Muslim sailors from the port of Basra (including the fictional character Sinbad the Sailor in the One Thousand and One Nights). Nutmeg was traded by Arabs during the Middle Ages and sold to the Venetians for high prices, but the traders did not divulge the exact location of their source in the profitable Indian Ocean trade, and no European was able to deduce its location.
In August 1511, Afonso de Albuquerque conquered Malacca, which at the time was the hub of Asian trade, on behalf of the king of Portugal. In November of the same year, after having secured Malacca and learning of Banda's location, Albuquerque sent an expedition of three ships led by his friend António de Abreu to find it. Malay pilots, either recruited or forcibly conscripted, guided them via Java, the Lesser Sundas, and Ambon to Run, arriving in early 1512. The first Europeans to reach the Bandas, the expedition remained in Banda for about a month, buying and filling their ships with Banda's nutmeg and mace, and with cloves in which Banda had a thriving entrepôt trade. An early account of Banda is in Suma Oriental, a book written by the Portuguese apothecary Tomé Pires, based in Malacca from 1512 to 1515. Full control of this trade by the Portuguese was not possible, and they remained participants without a foothold in the islands.
The trade in nutmeg later became dominated by the Dutch in the 17th century. The English and Dutch, through their competing East India and Dutch East India Companies, engaged in prolonged struggles to gain control of Run Island. At the end of the Second Anglo-Dutch War, the Dutch gained control of Run, while England controlled New Amsterdam (New York) in North America.
The Dutch waged a bloody war, including massacring and enslaving the inhabitants of the island of Banda, to control nutmeg production in the East Indies in 1621. Thereafter, the Banda Islands were run as a series of plantation estates, with the Dutch mounting annual expeditions in local war-vessels to extirpate nutmeg trees planted elsewhere.
As a result of the Dutch interregnum during the Napoleonic Wars, the British took temporary control of the Banda Islands from the Dutch and transplanted nutmeg trees, complete with soil, to Sri Lanka, Penang, Bencoolen, and Singapore. (There is evidence that the tree existed in Sri Lanka even before this.) From these locations they were transplanted to their other colonial holdings elsewhere, notably Zanzibar and Grenada. The national flag of Grenada, adopted in 1974, shows a stylised split-open nutmeg fruit. The Dutch retained control of the Spice Islands until World War II.
Connecticut received its nickname ("the Nutmeg State", "Nutmegger") from the claim that some unscrupulous Connecticut traders would whittle "nutmeg" out of wood, creating a "wooden nutmeg", a term which later came to mean any type of fraud.
World production of nutmeg is estimated to average between 10,000 and 12,000 tonnes per year, with annual world demand estimated at 9,000 tonnes; production of mace is estimated at 1,500 to 2,000 tonnes. Indonesia and Grenada dominate production and exports of both products, with world market shares of 75% and 20%, respectively. Other producers include India, Malaysia (especially Penang, where the trees grow wild within untamed areas), Papua New Guinea, Sri Lanka, and Caribbean islands, such as St. Vincent. The principal import markets are the European Community, the United States, Japan, and India. Singapore and the Netherlands are major re-exporters.
Nutmeg has been used in medicine since at least the seventh century. In the 19th century, it was used as an abortifacient, which led to numerous recorded cases of nutmeg poisoning. Although used as a folk treatment for other ailments, unprocessed nutmeg has no proven medicinal value today.
One study has shown that the compound macelignan isolated from M. fragrans (Myristicaceae) may exert antimicrobial activity against Streptococcus mutans, and another that a methanolic extract from the same plant inhibited Jurkat cell activity in human leukemia, but these are not currently used treatments.
Psychoactivity and toxicity
In low doses, nutmeg produces no noticeable physiological or neurological response, but in large doses, raw nutmeg has psychoactive effects. In its freshly ground form (from whole nutmegs), nutmeg contains myristicin, a monoamine oxidase inhibitor and psychoactive substance. Myristicin poisoning can induce convulsions, palpitations, nausea, eventual dehydration, and generalized body pain. It is also reputed to be a strong deliriant. For these reasons, nutmeg has been banned in Saudi Arabia.
Fatal myristicin poisonings in humans are very rare, but three have been reported, including one in an 8-year-old child and another in a 55-year-old adult, with the latter case attributed to a combination with flunitrazepam.
Intoxications with nutmeg had effects that varied from person to person, but were often reported to be an excited and confused state with headaches, nausea, dizziness, dry mouth, bloodshot eyes, and memory disturbances. Nutmeg was also reported to induce hallucinogenic effects, such as visual distortions and paranoid ideation. Intoxication took several hours before the maximum effect was reached. Effects and aftereffects lasted up to several days.
Myristicin poisoning is potentially deadly to some pets and livestock, and may be caused by culinary quantities of nutmeg harmless to humans. For this reason it is recommended not to feed eggnog to dogs.
History of use
Peter Stafford's Psychedelics Encyclopedia quotes an 1883 report from Mumbai noting that "the Hindus of West India take nutmeg as an intoxicant", and records that the spice has been used for centuries as a form of snuff in rural eastern Indonesia and India, later seeing the ground seed mixed with betel and other kinds of snuff. In 1829, the Czech physiologist Jan Evangelista Purkinje ingested three ground nutmegs with a glass of wine and recorded headaches, nausea, hallucinations, and a sense of euphoria that lasted for several days.
Swiss chemist Albert Hofmann, who discovered LSD, and Harvard ethnobotanist Richard Evans Schultes documented reports of nutmeg's use as an intoxicant by students, prisoners, sailors, alcoholics, and marijuana smokers. In his autobiography, Malcolm X writes about taking nutmeg and other "semi-drugs" while serving time in prison.
The Angewandte Chemie International Edition records the use of nutmeg as an intoxicant in the United States in the post-World War II period, notably among young people, bohemians, and prisoners. A 1966 New York Times piece named it along with morning glory seeds, diet aids, cleaning fluids, cough medicine, and other substances as "alternative highs" on college campuses.
Toxicity during pregnancy
Nutmeg was once considered an abortifacient, but may be safe for culinary use during pregnancy. However, it inhibits prostaglandin production and contains hallucinogens that may affect the fetus if consumed in large quantities.
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