Sweet Potato Pie
["1 unbaked pie shell", "2 c. mashed sweet potatoes", "5 Tbsp. melted butter", "1/2 c. brown sugar, firmly packed", "4 eggs, separated", "1/4 tsp. salt", "1 tsp. cinnamon", "dash of mace", "1/3 c. chopped walnuts", "2 c. milk"]
["Combine sweet potatoes, butter and brown sugar.", "Beat egg yolks; add salt, cinnamon and mace.", "Mix thoroughly.", "Add walnuts and milk.", "Beat egg whites until stiff; fold in and pour into pie shell.", "Bake at 425\u00b0 for 15 minutes.", "Reduce heat to 375\u00b0 and bake 25 minutes longer or until firm.", "Cool.", "Top with whipped cream if desired."]
["shell", "mashed sweet potatoes", "butter", "brown sugar", "eggs", "salt", "cinnamon", "mace", "walnuts", "milk"]