Lemon Sour Cream Pie

3 1/2 tablespoons cornstarch
1 cup sugar
1 tablespoon lemon rind
1/2 cup lemon juice
3 egg yolks
1 cup milk
1/4 cup butter
1 cup sour cream
1 cup heavy whipping cream

1. In a heavy saucepan, combine sugar, cornstarch, lemon rind, lemon juice, egg yolks and milk.
2. Cook on medium heat until thick, storing constantly.
3. Add butter and let mixture cool to room temperature. Stir in sour cream and pour filling into pie shell.
4. Cover with whipped cream.
5. Store in refrigerator.

Note: I tried this for Thanksgiving. Mmmm it is really good.