If there is one thing the United States takes seriously (outside of sports), it's barbecue. Different in every region, barbecuing is an art, and Americans take pride in their special blend of slow-cooked meat, spices, and tangy sauces. But the US didn't invent the cooking form, nor do Americans have a monopoly on it--from Mongolian lamb to Fijian pig and Chinese char siu, barbecue's endless variations have circled the globe. In this history...