Hazelnut

• 1. Botanical Origins And Morphology

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  The hazelnut is the fruit of the hazel tree and therefore includes any of the nuts deriving from species of the genus Corylus. Most commercial varieties come from the species Corylus avellana. These nuts are also known as cobnuts or filberts according to specific species differences. A hazelnut cob is roughly spherical to oval, about 2 centimeters long and 1.5 centimeters in diameter. An outer fibrous husk surrounds a smooth shell that protects the edible seed inside. A filbert nut is more elongated, being about twice as long as its diameter. The nut falls out of the husk when ripe, approximately seven to eight months after pollination. Nuts make up between 33.2% to 49.5% of the total fruit weight depending on the cultivar grown. Cultivars close to the Mediterranean Sea have the largest nut to fruit ratio available today.

• 2. Mesolithic Archaeological Evidence

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  In 1995 researchers found evidence of large-scale Mesolithic nut processing some 8000 years old in a midden pit on the island of Colonsay in Scotland. This discovery consisted of a large shallow pit full of remains from hundreds of thousands of burned hazelnut shells. Hazelnuts appeared on other Mesolithic sites but rarely in such quantities concentrated within one single pit. The nuts were radiocarbon dated to 7720 plus or minus 110 BP which calibrates to around 5770 BCE. Similar sites exist only at Farnham in Surrey and Cass ny Hawin on the Isle of Man. Pollen analysis suggests all the hazel trees were cut down at the same time during harvest. The scale of activity combined with scarcity of large game suggests this community maintained a largely vegetarian diet. Originally the pit sat on a beach close to shore associated with two smaller stone-lined pits whose function remains obscure.

• 3. Global Production And Agriculture

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  Turkey was the world's largest producer of hazelnuts in 2023 accounting for 57.7% of total production. World production reached 1.13 million tonnes that year led by Turkey with Italy and the United States as other major producers. Production in the United States centers almost entirely within the Willamette Valley of Oregon. Traditional cultivation involves multi-trunk trees where rootstock forms by the variety itself. To enhance mechanization growers graft a scion onto Corylus colurna rootstock creating a single trunk tree. Four primary pieces of equipment handle commercial harvesting including the sweeper harvester nut cart and forklift. The sweeper moves nuts into row centers while the harvester lifts material off ground separating nuts from leaves and twigs. Most commercial growers wait for nuts to drop rather using equipment to shake them directly from trees.

• 4. Culinary Applications And History

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  Hazelnuts appear in confections to make pralines chocolate truffles and hazelnut paste products including nougat. Ground hazelnuts combined with chocolate developed around Turin Italy became known as gianduia. Finer pulverization of these nuts subsequently created Nutella and similar spreads. In Austria hazelnut paste serves as an ingredient for making tortes such as Viennese hazelnut torte. Kyiv cake uses hazelnut flour to flavor its meringue body while crushed nuts decorate sides. Dacquoise French dessert cakes often contain layers of hazelnut meringue. Turkish cuisine and Georgian cuisine feature snacks like churchkhela and sauces called satsivi often mixed with walnuts. Hazelnut oil pressed from nuts is strongly flavored and high in monounsaturated fat used as cooking oil or salad dressing. Frangelico liqueur also relies on hazelnut flavoring for its distinctive taste profile.

• 5. Nutritional Composition And Health

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  Raw hazelnuts contain 5% water 61% fat 17% carbohydrates and 15% protein by weight. A reference amount supplies significant food energy and provides numerous essential nutrients exceeding 20% Daily Value. These nuts hold particularly high amounts of protein dietary fiber vitamin E thiamin folate manganese and magnesium all surpassing 20% DV thresholds. Moderate amounts between 10% and 19% DV include niacin pantothenic acid vitamin K zinc and potassium. Hazelnuts account for 93% Daily Value of dietary fat within a 100 gram serving. Fat components consist primarily of oleic acid at 75% total followed by linoleic acid at 13%. Saturated fats make up only 7% combined palmitic acid and stearic acid content.

• 6. Literary Symbolism In Culture

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  Julian of Norwich used the hazelnut as a literary device within her mystical Christian treatise Revelations of Divine Love written around 1416. The hazelnut shell appears imagined as a chariot for fairy Queen Mab in William Shakespeare's play Romeo and Juliet. English Romantic poet John Keats employed the hazel fruit as a metaphorical device in his poem To Autumn. These cultural references span from medieval mysticism to Victorian poetry showing enduring symbolic value. Authors utilized specific physical traits like the small size or protective shell to convey spiritual or emotional themes throughout history.