We all seem to have a favorite Christmas song that puts us in the holiday spirit. One of the most popular is “The Christmas Song” as performed by Nat King Cole in 1961. The song is often sub-titled “Chestnuts Roasting on an Open Fire.” But have you actually sampled chestnuts or seen how they grow? AgDay TV host Clinton Griffiths went in search of one of the few farmers who actually grows chestnuts. He found farmer Paul Thelen in southwest Michigan.