A dog looks on impatiently as men slaughter a chicken for visitors at the home of Lan Guihua, a widowed farmer living in Ganjiagou Village, Sichuan Province, China. (Lan Guihua is featured in the book What I Eat: Around the World in 80 Diets.) In this region, each rural family is its own little food factory and benefits from thousands of years of agricultural knowledge passed down from generation to generation.