Yesterday, I went to a truffle party. In my mind, a truffle is a type of chocolate. I knew that this event would have meat, and not chocolate, but in my mind, a truffle is chocolate – I couldn't get that out of my mind.
Today, I learned that a truffle is actually the fruiting body of a fungus that grows underground. Lovely sounding, eh? Chocolate truffles were named because of their resemblance to the subterranean fungus.