While writer Rebecca Mead serves up North Korean barbecue diplomacy, journalist Dan Koeppel examines the possible extinction of the banana and Padma Lakshmi prepares some tangy and tart dishes. Chef Eric Gower cooks silken tofu, Mark Bittman cooks everything vegetarian and David Kamp explores our fascination with celebrities and exotic foods . Writer Sarah Murray follows the journey of food from farm to fork, and Laura Avery has a fresh Market Report.