The late, truly great Marcella Hazan taught many of us what real Italian food is and how to cook it. And yet many people, including me, didn't know much about this remarkable woman. But now there's a terrific documentary about her life and work, 'Marcella'. We talk to Pete Wells of The New York Times and the director of 'Marcella', Peter Miller, about the many aspects of her life that have gone unnoticed until now.