4 (1 oz.) sqs. unsweetened chocolate
1 1/2 stick butter, softened
1 c. sugar
2 tsp. vanilla
4 eggs
1 (8 inch) chocolate graham cracker crust

Melt chocolate in double boiler; let cool. In mixer, beat butter until light and fluffy. Add sugar, melted chocolate and vanilla. Beat until light and fluffy. Add eggs. Beat 3 minutes until smooth and thick. Pour into crust and chill thoroughly.