Award-winning food writer and chef Elaine Khosrova discusses her fascinating work, Butter: A Rich History. The delicious kitchen staple we so often take for granted is not merely a stick tucked into our refrigerator door. It's a culinary catalyst, an agent of change, a gastronomic rock star. From its accidental invention in a long-ago herder's pouch to its ubiquitous presence in the world's most fabulous cuisines, butter is boss. Now, it finally gets its due.