Grandma'S Lemon Cream Pie
["1 c. sugar", "5 Tbsp. cornstarch", "1/4 tsp. salt", "2 c. milk", "3 egg yolks", "3 Tbsp. butter", "1 tsp. grated lemon peel", "1/3 c. lemon juice", "1 (9-inch) baked pie shell or graham cracker crust"]
["In a saucepan, mix sugar, cornstarch and salt.", "Add milk gradually and stir until smooth.", "Cook over low heat, stirring constantly, until smooth and thick, about 10 minutes.", "Stir a small amount of hot mixture into beaten egg yolks, then gradually add yolks to remaining hot mixture.", "Continue cooking, stirring constantly, about 5 minutes.", "Remove from heat.", "Add butter, lemon peel and juice and blend thoroughly.", "Pour hot filling into pie shell.", "If made with a baked pie shell, top with meringue.", "If a graham cracker crust is used, serve with whipped cream."]
["sugar", "cornstarch", "salt", "milk", "egg yolks", "butter", "lemon juice", "shell"]