Hazel nuts are a type of fruit that grow on hazel trees. Although they taste good, they aren't as sweet as other fruits, which is why they aren't as popular as other nut toppings. In addition, hazelnuts have a very thin shell made from a hard layer of fiber, called cork. With one look at this hard fibrous layer it is easy to see why the cashew and pistachio do not produce any shell when ripening.
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