Sweet Potato Pie
["2 large sweet potatoes (about 2 c.)", "1 c. sugar", "1 beaten egg", "2/3 c. milk", "1 stick butter", "1 tsp. cinnamon *"]
["*Nutmeg and ginger are good, also."]
["sweet potatoes", "sugar", "egg", "milk", "butter", "cinnamon"]