Betty's collection of over 4,000 cookbooks is so big that she needs a separate house to store them all! "It's an addiction," she admits as she shows the tattered pages from cookbooks dating back to the 1930s. "I love cookbooks!" Watch the video to see which ones are her favorites, and how Rachael comes to her rescue with a few important additions -- including one of Rachael's favorites, The Essentials of Italian Cooking by Marcella Hazan.