There are several species of hazel and in Greece we can find two them: day hazel or filbert (Corylus avellana - Korila the avellana) and Wild Hazel. The Korila name derives from the ancient Greek word "Korys" (helmet), and its fruit is fresh hazelnut when surrounded by cortical shell making it look like a military helmet. The word is Turkish hazelnut roots (fındık) and integrated into the Greek vocabulary from the time of Turkish occupation.
The nuts are nutritious, rich in protein and minerals. Eaten mostly cooked and is very good nuts. Used in the chocolate industry, confectionary and bakery where milled with wheat for bread production wikipedia