Preheat oven to 400 degrees F.
Wash and poke the sweet potatoes and roast for an hour until very soft.
Peel while still warm and mash until smooth. Separate them by color.
Using the Stackable Gourmet, or a can that has been hollowed out, make stacks by layering the mashed sweet potatoes with the cranberry relish and repeat the layers, ending with the cranberry relish on top.