Sweet Potato Balls(Unusually Delicious)  
["4 to 5 large sweet potatoes", "sugar to taste", "3/4 c. butter", "1 tsp. rum flavoring", "large marshmallows", "1 (7 oz.) can coconut", "chopped nuts (optional)"]
["Boil sweet potatoes until tender. Add sugar, butter and flavoring. Mix and place in refrigerator overnight."]
["sweet potatoes", "sugar", "butter", "rum flavoring", "marshmallows", "coconut", "nuts"]