The hazelnut (Corylus avellana) is the oldest native fruit species in Europe and belongs to the birch family (Betulaceae). The hazelnut contains many healthy fats and grows on a deciduous hazel bush. The shrub can grow up to five metres high and bears deciduous leaves. Originally, the hazel shrub comes from Asia Minor and Central Europe. In Italy, the hazelnut was already cultivated in ancient times.