Whether you go yellow or white, sweet or savory, grits are a Southern food staple now popping up on menus all over the country. Food writer Erin Byers Murray goes deep in Grits: A Cultural and Culinary Journey Through the Stapl e, talking with growers, millers and chefs to understand the origins and evolution of grits. Along the way, she examines how race, gender and politics simmer in the significance of grits.