French Silk Pie - cooking recipe

Ingredients

1 baked 8 or 9-inch pie shell
1 c. whipping cream
1 pkg. (6-oz.) semisweet chocolate pieces
1/3 c. butter
1/3 c. sugar
2 beaten egg yolks
3 Tbsp. creme de cacao or whipping cream
Whipped cream or whipped dessert topping (optional)
Chocolate curls or miniature chocolate pieces (optional)

Preparation

In a heavy 2-quart saucepan combine the 1 cup whipping cream, chocolate pieces, butter, and sugar.
Cook over low heat, stirring constantly, till chocolate is melted.
This should take about 10 minutes.
Remove saucepan from heat.
Gradually stir about half of the hot mixture into the beaten egg yolks.
Return egg mixture to saucepan.
Cook over medium-low heat, stirring constantly, till mixture is slightly thickened and nearly bubbly, about 3 to 5 minutes.
Remove saucepan from heat (mixture may appear to separate).
Stir in creme de cacao or whipping cream.
Place saucepan in a bowl of ice water; stir occasionally till mixture stiffens and becomes hard to stir (20 minutes).