Lemon Tarts

These are very TART but much better than store bought.  Very rich so I suggest making them small tarts. Dad would love these!

Ingredients:

Prepared tart shells, baked and cooled
2 cups white sugar
7 tablespoons cornstarch
3 tablespoons lemon zest
1 cup fresh lemon juice
6 egg yolks, slightly beaten
1 1/2 cups half-and-half cream
1/2 cup whipping cream, unwhipped
1/2 cup butter or 1/2 cup margarine cut into pieces
3/4 cup sour cream
cool whip frozen whipped topping

In the microwave or stove top, combine sugar, cornstarch, lemon zest, lemon juice, egg yolks, half and half amd whipping cream (can use 2 cups half and half if desired and omit the whipping cream).  Whisk to combine.

Cook until thickened.  Stir in butter.  Whisk until butter is melted and mixture is smooth.  Cool to almost room temperature, stirring every so often.  Stir in sour cream until well blended.  Fill tart shells and top with cool whip.