Alton Brown visits Roth Kase USA, Ltd. to go over the three major stages of cheese production. Talks about how to store cheese and discusses the history of fonduing and makes a cheese fondue and grilled cheese sandwich. Covers the science of the cheese soufflé and how to manage oven heat. Provides a historical perspective on onions and visits Vidalia, Georgia to talk about vidalia onions. Talks about onion varieties and how to store them. Shows how to make onion soup. Includes the following recipes : Fondue vudu ; Big cheese squeeze ; Cheese soufflé ; French onion soup.