Yams are a mystery food. They are not a vegetable, not a fruit, not a protein. WTF are they?
And let's not resort to a dictionary definition...that's boring... Really...why CAN'T sweet potatoes get a category and stick to it? I see them showing up everywhere...as vegetables (they are too sweet for that), as dessert...(c'mon, really?), and even as French fries...(are you nuts!)... What's your idea of where a sweet potato fits in your life?