Sweet Potatoes with Marshmallow Topping

Boil several sweet potatoes until done when pierced with a fork or knife. When cool to touch, peel. Slice lengthwise. Place in greased baking dish. Sprinkle potatoes with a bit of water and brown sugar (as much as desired). Dot with butter. Bake at 350F till syrupy. Cover with marshmallows and brown in oven.