Are certain foods crueler than others? Remember the 2002 foie gras flap started by Chef Charlie Trotter in Chicago? We’ll talk this hour with Mark Caro the journalist who broke the story in the Chicago Tribune. Caro’s new book is “The Foie Gras Wars: How a 5,000-Year-Old Delicacy Inspired the World’s Fiercest Food Fight” (Simon and Schuster, 2009).