National Hazelnut Cake Day in USA
National Hazelnut Cake Day in USA is held on June 1. This event in the first decade of the month June is annual. 
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“Hazelnut” is the name coined by the English and applied to the native species by early settlers. In 1981, the Oregon Filbert Commission decided to conform to the common standard and began emphasizing “hazelnut.” Regardless of what name you call it by, this is one nut that's been revered for centuries.
Turkey is the world's largest producer of hazelnuts, with Italy, Spain, the U.S., and Greece being the other players in the world market. Something like a quarter of the world's crop is used by Ferrero SpA, the Italian company that makes Nutella and other chocolate-hazelnut combinations.
The hazelnut flavor goes well with chocolate, caramel, apple, banana, apricot, berries, and more. So it is up to you to decide which one you want to add to your hazelnut cake.
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