Corylus avellana, 600 meters above sea level, 12June2010, North facing slope, Bernese Highlands, Swiss Alps.

Hazelnut or filbert. At the risk of sounding too much like an oldtimer…

Once upon a time, before European mass produced chocolate became common in the United States, if you wanted chocolate with nuts, you had primarily chocolate with peanuts. Then if you took the big voyage to Europe and tried to find chocolate and peanuts…impossible.  Chocolate and nuts in Europe meant chocolate and hazelnuts. Need I say mouth watering?