A couple of days ago I got an email from Ochen Kaylan, a producer of American Public Media’s Weekend America. He was gathering information about the differences between Sweet Potatoes and Yams, for a Thanksgiving show, and invited me to participate. We all know the sweet, sticky, gooey side dish that is loaded up with brown sugar, spices, lots of butter and the ubiquitous marshmallow topping. But people always wonder which to use, sweet potato or yam? Really what is the difference?