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The fruit of the walnut tree, which grows in temperate zones throughout the world. The two most popular varieties of walnut are the ENGLISH WALNUT (also called Persian walnut) and the BLACK WALNUT. A close relative is the BUTTERNUT, also referred to as white walnut. ENGLISH WALNUTS are the most widely available and come in many varieties-some with moderately thick shells, others with shells so thin a tiny bird can crack them open.

The nuts of all the species are edible, but the walnuts commonly available in shops are from the common walnut, the only species which has a large nut and thin shell. A horticultural form selected for thin nut shells and hardiness in temperate zones is sometimes known as the 'Carpathian' walnut. The nuts are rich in oil, and are widely eaten both fresh and in cookery. Walnut oil is expensive and consequently is used sparingly; most often in salad dressing. Walnuts are also an excellent source of omega-3 fatty acids, and have been shown as helpful in lowering cholesterol. They need to be kept dry and refrigerated to store well; in warm conditions they become rancid in a few weeks, particularly after shelling. Oil paint often employs walnut oil as an effective binding medium, known for its clear, glossy consistency and non-toxicity.

Brazil nuts are nutrient-dense, which means that, in relation to their size, they contain a wide variety of nutrients. Brazil nuts, in fact, are chock full of significant nutrients, including protein, fiber, selenium, magnesium, phosphorous, and thiamin (there is also a decent amount of niacin, vitamin E, vitamin B6, calcium, iron, potassium, zinc, and copper). Brazil nuts are also a source of arginine (an amino acid that plays a role in blood clot formation) and flavonoids--important antioxidant compounds believed to be protective against both coronary disease and cancer.



While it is true that Brazil nuts are high in fat, the fat is mostly unsaturated, the type of fat that has been associated with lowering cholesterol. The large crescent-shaped kernels contain alpha-linolenic acid, which converts to omega-3 fatty acids in the body; it is the omega-3 fatty acids which scientists feel may reduce the risk of heart disease.



Brazil nuts are actually large seeds of giant trees that grow in the Amazon jungle. These extraordinary nuts are shaped like triangular orange segments, are extremely hard, and are found in clusters of 12 to 24 inside a 4" to 6" pod that resembles a coconut (a botanical definition of a nut is a fruit with a hard, dry shell that needs to be cracked open to release the kernel). The pods are gathered when they have fallen from the trees and they must be chopped open to obtain the nuts. Falling Brazil nut tree pods can be dangerous, and Indians who gather the pods make sure to do so in clement weather.



A mature tree can produce between 250 and 500 pounds of Brazil nuts per year. Brazil nut trees do not begin to produce nuts in significant quantities until after about 12 to 15 years. The majestic Brazil nut tree grows wild in the tropical rain forests, and most attempts to cultivate it elsewhere have been unsuccessful. Although thousands of tons of Brazil nuts are exported each year from Brazil, almost all of Brazil nut production is a result of wild forest trees and wild harvesting.

The almond that we think of as a nut is technically the seed of the fruit of the almond tree, a glorious medium-size tree that bears fragrant pink and white flowers. Like its cousins, the peach, cherry and apricot trees, the almond tree bears fruits with stone-like seeds (or pits) within. The seed of the almond fruit is what we refer to as the almond nut.



Almonds are off-white in color, covered by a thin brownish skin, and encased in a hard shell. Almonds are classified into two categories: sweet (Prunus amygdalu var. dulcis) and bitter (Prunus amygdalu var. amara).



Sweet almonds are the type that are eaten. They are oval in shape, usually malleable in texture and wonderfully buttery in taste. They are available in the market either still in their shell or with their shell removed. Shelled almonds are available whole, sliced or slivered in either their natural form, with their skin, or blanched, with their skin removed.



Bitter almonds are used to make almond oil that is used as a flavoring agent for foods and liqueurs such as Amaretto. They are otherwise inedible as they naturally contain toxic substances such as hydrocyanic acid. These compounds are removed in the manufacturing of almond oil.



A high-fat food that's good for your health? That's not an oxymoron, its almonds. Almonds are high in monounsaturated fats, the same type of health-promoting fats as are found in olive oil, which have been associated with reduced risk of heart disease. Five large human epidemiological studies, including the Nurses Health Study, the Iowa Health Study, the Adventist Health Study and the Physicians Health Study, all found that nut consumption is linked to a lower risk for heart disease. Researchers who studied data from the Nurses Health Study estimated that substituting nuts for an equivalent amount of carbohydrate in an average diet resulted in a 30% reduction in heart disease risk. Researchers calculated even more impressive risk reduction--45%--when fat from nuts was substituted for saturated fats (found primarily found in meat and dairy products).



In addition to their cholesterol-lowering effects, almonds' ability to reduce heart disease risk may also be partly due to the antioxidant action of the vitamin E found in the almonds, as well as to the LDL-lowering effect of almonds' monounsaturated fats. (LDL is the form of cholesterol that has been linked to atherosclerosis and heart disease). When almonds are substituted for more traditional fats in human feeding trials, LDL cholesterol can be reduced from 8 to 12%.

Hazelnuts, sometimes mistakenly referred to as filberts, are sweet, acorn-shaped nuts that are rich in phosphorous, potassium, copper, zinc, magnesium, selenium, dietary fiber, folate, and vitamin E. Hazelnuts are also an excellent source of plant sterols that are believed to play a role in the prevention of certain diseases, including colon cancer and heart disease. Although the names are often used interchangeably, filberts are actually a cultivated variety of European hazelnut and are slightly larger than other hazelnuts.



While the principal hazelnut-producing countries are Turkey, Spain, Italy, and France, they are also grown in the U.S. on hazelnut farms in Oregon and Washington. Wild hazelnuts (also sometimes referred to as cobnuts) grow in temperate regions around the world. The hazelnut has a long, fuzzy outer husk that opens as the nut ripens, revealing a hard, smooth shell. Believed to have originated in Asia, the hazelnut is one of the oldest agricultural food crops, providing a high-quality protein to humans for thousands of years. Ancient Chinese manuscripts dating back 5,000 years refer to the hazelnut as a sacred food bestowed directly on us by the heavens; and the ancient Greeks and Romans prized hazelnuts for their medicinal properties.



Hazelnuts are a nutrient-dense food that provide excellent nourishment as well as culinary diversity. While ancient lore has it that hazelnuts held the cure for everything from baldness to gastrointestinal illnesses, modern research is informing us that nuts, in general, if consumed in moderation, may confer heart healthy benefits. The monounsaturated fats in nuts are believed to lower LDL ("bad") cholesterol levels. When compared with other nuts, hazelnuts have a high vitamin E profile; and current research indicates that the antioxidant power of vitamin E may play a significant role in preventing coronary heart disease as well as certain kinds of cancer.





Varieties



Available in-shell and shelled forms, chopped, ground, whole, and roasted or natural, hazelnuts are often used in the baking and confectionery industries. Hazelnuts impart sweet, rich flavor and texture to numerous foods, and are added to many products including cookies, candies, ice cream, breakfast cereals, biscotti, tortes, chocolates, coffee, bread, liqueurs, and spreads. Some other forms of hazelnut include the following:



Hazelnut butter is a creamy, smooth spread (like peanut butter) made from roasted hazelnuts that offers a full, sweet flavor to recipes.



Hazelnut meal & flour is made from hazelnuts that have been processed into fine particles, and adds texture and flavor to many dishes, and may be added to cake batters, breads, fillings.



Hazelnut oil is a delicacy derived mainly from Italian hazelnuts and is pressed from hazelnuts that have not been roasted. Full of flavor, hazelnut oil is excellent for seasoning desserts as well as salads, sauteed foods, and crepes. Make sure to store hazelnut oil in the refrigerator as it easily turns rancid if exposed to heat and light.



Hazelnut paste, with added natural sweeteners, is used as a confectionery paste in hazelnut marzipan, icings, bakery fillings, ice cream, and cookies.

This native American nut is a member of the hickory family. It has a fat content of over 70 percent...more than any other nut. Pecan trees prefer temperate climates and are widely grown in Georgia, Oklahoma and Texas, and as far north as Virginia. The nut's smooth, tan shell averages about 1 inch in length and, though hard, is relatively thin. The buttery-rich kernel is golden-brown on the outside and beige inside. Chopped or halved shelled pecans are available year-round in cellophane packages, cans and jars. Though unshelled pecans are also available throughout the year, their peak season is during the autumn months.