"On Second Thought" continues its Main Ingredient series in which a chef tells us about his or her essential Southern ingredient. For Chef Nolan Wynn, that ingredient is the peanut. He's the executive chef of Banshee in East Atlanta Village, which he co-founded with Faielle Stocco, Peter Chvala and Katie McDonald. "On Second Thought" host Virginia Prescott visited Wynn to learn how to make his savory peanut brittle.