Thanksgiving dishes are traditionally made from food raised in North America. Much of it was first eaten by the First Nations. Read about it at the CBC.
Yams, or sweet potatoes, are not native to North America, but they are also a traditional Thanksgiving food. For simple ways to cook them, read this at ezinearticles.com. For some more ways to cook them, including a soup, read this article at canada.com.
(USDA photo by Scott Bauer)