Mom's Lemon Cream Pie

Easy Pie crust:

4 cups flour

1 tablespoon sugar

1 tablespoon salt

1 3/4 cup Crisco Shortening

1 tablespoon vinegar

1 egg

1/2 cup water

Lemon Cream Filling:

1 cup sugar

3 ½ tablespoons cornstarch

1 tablespoon grated lemon zest

1/4 cup fresh lemon juice

3 egg yolks slightly beaten

1 cup whole milk

¼ cup frozen butter

1 cup sour cream

Whipped Cream and White Chocolate Topping:

1 cup whipping cream

2 tablespoons powdered sugar

Shaved White Chocolate Curls