Caviar is a tasty delicacy consisting of the unfertilized eggs (roe) of a sturgeon fish. Traditional caviar comes primarily from the Caspian Sea, Iran or Russia. It's harvested and produced by local fishermen. The Caspian Sea is famous for its three known sturgeon species: Beluga, Sevruga and Ossetra. Beluga caviar is considered to be the best caviar in the world.