On a few TV documentaries I heard of pisco, a liquor made in Peru from distilling wine, grains, and various fruits. They even showed interviews with some of the producers of pisco. Today I googled pisco and went over a few dozen sources on the subject. But they all say Pisco is a brandy made from specific grapes brought in by the Spanish colonists. None mention a mixture of grain and other fruits. Now I'm confused. How can I tell which source is reliable?