In 1995 in Scotland, a midden pit on Colonsay Island, a farmer came across a shallow pit with hundreds of thousands of burned hazelnuts.
The nuts were radiocarbon dated to circa 7000 BC. Did cave dwellers enjoy fresh hazelnut coffee in the mornings.
Hazelnut is a shrub grown in Oregan and Washington in the USA and abundantly in England in hedge rows. Hazelnuts, full of protein and unsaturated fat, thiamine and B6. Most of the hazelnut flavored items sold are made from root sprouts.