Black truffles are a famous gourmet food but scientists have recently started to investigate their medicinal properties as well. Some of the effects that could be used by the pharmaceutical industry are the boost of the immune and cardiovascular systems, decrease of high cholesterol levels, better sexual health, treatment of cancer and aging management. Black truffles can also cure food intolerance, pain caused by rheumatism and sleep issues. They are considered an anti-aging super food due to the rich content of antioxidants. The strong and unique taste of black truffles can transform any dish into a delicacy. It should be added at the end, after the cooking is complete, only a very small amount is required. It pairs well with any recipe but is usually added to pastas, poultry, beef or rice. It can also be an aromatic ingredient in vinegar or olive oil. A number of volatile organic compounds (VOC's) have been identified as the reason for the unique flavour of black truffles. Scientists have isolated several aromatic hydrocarbons, sulphur compounds, terpenes and phenols. They also include a generous amount of quality natural proteins, that are digested easily. In traditional societies, truffles were considered to be an effective aphrodisiac. Black truffle mushrooms have been considered a special expensive food since ancient times. Any dish that includes truffles today will mention this fact due to their gourmet reputation. They are one of the ingredients that have remained popular throughout history. Truffles superficially resemble small potatoes in shape and size. Black truffles are immuno-modulators and can make the immune function adapt to external threats and increase its reaction to the needed level. A weak immune system is boosted, while one that is too active becomes balanced, avoiding for example autoimmune diseases. In addition, black truffles are potent killers of bacteria and their content of antioxidants makes them useful in the treatment of cancer. Truffle oil has an exquisite aroma but the real product is extremely expensive. However, chemists have found an ester compound that smells almost like real truffles and can be produced synthetically, in order to create affordable oil. Commercially available truffle oil usually consist of a quality base product, the most common being extra virgin olive oil. Both white and black truffles can be added to it, changing the color of the oil to light or dark. Real truffle oil, produced only from truffles, has a powerful aroma and an average content of fatty acids. It is a strong antiseptic and antioxidant oil. However, oil produced solely from these mushrooms is extremely expensive and almost impossible to find.
Black truffles are some of the tastiest and most expensive edible mushrooms. Due to their extremely high cost, the usual practice is to cut very thin slices and to add them on dishes for flavour. Another option to achieve the same effect is to use the truffles to extract oil that can be sprayed on food. However, truffles are so expensive that real truffle oil is impossible to find, the varieties available in stores are actually using chemicals that replicate the taste of the natural product. In areas where truffles are harvested from the wild, they are usually offered for sale fresh. When buying them, choose the fruiting bodies with firm flesh and without any bruises. Dried truffles are more commonly found in markets, packaged in vacuum containers. Supermarkets now offer many products with truffle flavoring, such as oil, sugar, honey and others. It is also possible to buy canned truffles, with the fruiting body conserved in water. Truffles are the most delicious when they are fresh, so they should be consumed as fast as possible. If you must, store them in the refrigerator for up to a week. In order to make them last longer, mix the truffles with white or Madeira wine in an airtight container. Sliced truffles can be kept for one month covered in oil or Madeira wine.
Black truffles have a natural habitat that covers areas of France, Italy and Spain. Scientists suspect that during the last Ice Age, the trees that have a symbiotic relation with truffles retreated to these areas. The mushrooms have always been present there but the real tradition of harvesting has started about 200 years ago. Truffles must be gathered manually, using old methods, and their habitat is in very large natural forests. Pristine forests are still found in many areas of Europe, for example in the Spanish province of Castell�n, especially the Alto Maestrazgo county, where truffles have ideal growth conditions. Some of the local villages are famous for truffles, for example Alboc�sser, Atzaneta, Morella or Culla. However, pollution and climate changes are increasingly threatening these traditional areas. After 2010, a serious productivity drop of truffles found in natural forests has been detected. This is being compensated by cultivation. In Spain, the main cultivation area is in Aragon in the Soria, Teruel province. Several thousand hectares of central Spain are now dedicated to truffle cultivation. Areas with burnt forests seem to be a great development option, since these already have the legal status of forest land and no additional permits are required to plant new trees and truffles there. Black truffles are now being cultivated in other countries in the world, far away from their native range. They are harvested in Wales or North America but also in Australia, New Zealand, Chile and South Africa. One of the methods used is to plant hazel trees already inoculated with truffle mycelium in their roots. However, up to ten years are needed until the first fruiting bodies can be harvested. As underground mushrooms, black truffles can't be detected by people who walk in the woods. They can be located anywhere in forests, there are no clear patterns and the exact place must be discovered using trained animals. The demand for truffles will always be much greater than the supply, so they are extremely expensive.
The main components of black truffles are carbohydrates, which make up about 60%. They are extremely rich in proteins, with a content of around 20%, and have a low amount of fats, generally between 3 and 7%. These fats are split between saturated and unsaturated ones. Black truffles also include a large amount of minerals and some dietary fibers as well. The minerals supplied are magnesium, manganese, zinc, copper, iron, sodium, potassium, calcium, and aluminium, all of them important for human health. However, except for some vitamin C the vitamin content is low.
Wild truffles have a symbiotic relation with trees such as oaks, poplars, pecans, beech, hazelnuts and elms. As part of their propagation method, truffles attract wild animals at maturity by producing strong odors and volatile organic compounds that resemble pheromones. During the autumn and winter, truffle harvesters use trained dogs to find them in the forests. Raking is another method to dig up truffles and locate them underground. While effective, this method is risky because it can cut the truffles and the damage significantly reduces their value. A second problem is that raking severs the link between unripe truffles and trees, so they will never reach maturity.