1. Preheat oven to 325 degrees. Puree sweet potatoes, butter, juice and brown sugar in a food processor until smooth or mash well with a potato masher. Don't use an electric mixer - stuff flies around. 2. Pour into a greased casserole and sprinkle on optional toppings. 3. Bake at 325 degrees for 20 to 35 minutes. This can be held warming in the oven for a while. Serves 4 to 6.