Yam and sweet potato dishes are an essential part of any holiday feast. Candied, mashed, glazed, or part of sweet casseroles, there are many ways to prepare these flavorful and nutritious root vegetables. Although not common outside of the U.S, the combination of yams with marshmallows has long been a favorite, usually seen during the holidays, especially at Thanksgiving tables all across the country. If you aren't a fan of the marshmallow topping or find it too sweet, leave it out or add the marshmallows to only half of the baking dish.