Sour Cream Lemon Pie

1 cup sugar

3 T cornstarch

1/2 cup butter

1 T lemon rind

1/4 cup lemon juice

3 egg yolks

1 cup milk

1 cup sour cream

Mix all ingredients except sour cream and butter. Bring to a boil slowly (mixture will thicken). Remove from heat. Add butter. Let cool. Add sour cream. Pour into pre-cooked pie crust.