9 inch pie shell, prebaked
1 c. granulated sugar
3/4 c. butter, softened
1 1/2 tsp. vanilla
1/4 tsp. cream of tartar
3 sq. unsweetened chocolate, melted
3 eggs
1 c. chilled whipping cream
2 tbsp. powdered sugar

Bake pie shell, cool. Beat granulated sugar and butter until light and fluffy. Stir in vanilla, cream of tartar and chocolate. Beat in eggs until light and fluffy (3 minutes). Pour into pie shell and refrigerate until set. Beat whipping cream and powdered sugar in a chilled bowl until stiff. Top pie with whipped cream, add, if desired, chopped nuts or chocolate curls. Refrigerate.