Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   1      cup           sugar
     1/4  cup           cornstarch
   1 1/4  cups          milk
   3                    egg yolks -- lightly beaten
   1      teaspoon      lemon rind -- grated
     1/3  cup           fresh lemon juice
     1/4  cup           margarine
   1      cup           sour cream
   1                    baked 9-inch pastry shell
                        whipped cream -- (optional)

Preparation:

1. Stir together sugar and cornstarch in 2-quart saucepan; gradually add milk, stirring until smooth 2. Stir in egg yolks, lemon rind and lemon juice until blended; add margarine. 3. Stirring constantly, bring to a boil over medium heat and boil 1 minute. 4. Pour into large bowl; cover surface of pudding with waxed paper or plastic wrap. 5. Refrigerate 1 hour. Fold in sour cream. 6. Turn into baked pastry shell; refrigerate. 7. If desired, serve with whipped cream.