Lemon Lush Pie

1 - 9 inch baked pie crust
1 cup white sugar
3 tablespoons cornstarch
1 cup milk
1/4 cup lemon juice
3 egg yolks, slightly beaten
1/4 cup butter or margarine
1 tablespoon grated lemon peel
1 cup dairy sour cream
                   
In a med saucepan, combine sugar and cornstarch. Stir in milk,
lemon juice, and egg yolks. Cook over med heat until thick, 
stirring constantly. Remove from heat, and stir in butter and 
lemon peel. Cool slightly. Fold in sour cream. Spread filling in
crust. Refrigerate for 2 hours until set.