1 c. sugar
1 c. butter
3 sq. unsweetened choc., melted & cooled
1 tsp. vanilla
4 eggs

Cream butter and sugar. Add chocolate, vanilla and 2 eggs. Beat at high speed for 5 minutes. Add 2 eggs and beat 5 more minutes. Pour into graham cracker crust and chill. Top with Cool Whip and chocolate shavings.