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Fruit or Vegetable?

Hazelnut

Hazelnut
Photo by Fir0002 under CC BY-SA 3.0
Is the Hazelnut a Fruit or Vegetable?
Botanically, this is...
Culinarily, this is...

Hazelnuts are the nuts of the hazel tree. I know, crazy, right? This is a very accurate name for them. Hazelnuts are nuts both botanically and culinarily. Hazelnuts are each a whole fruit formed from its own ovary. There is a thin husk fibrous surrounding the nut, but the nut is a fruit botanically.

Note that this is qualified to if it is the whole hazelnut that we are talking about. If we are talking about shelled hazelnuts, those are no longer the nut of the hazel, but merely the seed. Since the shell is the pericarp of the fruit, it is a key part of it being a nut botanically.

If we are talking about eating hazelnuts or hazelnut-containing foods however, these botanical definitions are irrelevant. Culinarily, hazelnuts are obviously considered to be nuts whether or not they have the shell on them. They taste very nutty, and literally have “nut” in the name. People consider them to be nuts, so they are nuts.