Oven-Roasted Sweet Potatoes and Onions

This so good and so easy. I tried adding some sweet Italian onions to this (you know, the purple ones) to give it some color, but once they were cooked the color either turned to a light or dark gray. Still, this has become one of my favorite ways to eat sweet potatoes or yams. I hate any version that uses brown sugar or marshmallow. Sweet potatoes and yams are usually sweet enough with just a little butter on them. Sometimes I add a quarter cup or so of raisins, especially if I happened to get one of those sweet potatoes that has lost its sweetness along the way. One thing I like about this is that there are only five ingredients (six if you add the raisins) and, other than cutting the onions, is especially easy. Try to use a variety of  sweet onions, but the heavy tear-jerkers will work, too.