c("In a heavy saucepan, combine sugar, cornstarch, lemon rind, lemon juice and  egg yolks and milk.", "Cook  on medium heat until thick, stirring constantly.", "Add   butter  and let mixture cool to room temperature.  Stir in sour cream and pour  filling  into pie shell.", "Cover with whipped cream.", "Store in refrigerator.", "\"From Simple Meals (Lively50)\"                                     - - - - - - - - - - - - - - - - - -")