Preparation Combine bittersweet chocolate, cream and unsweetened chocolate in heavy medium saucepan. Stir over medium-low heat until melted and smooth. Cool to just lukewarm. Beat next 3 ingredients in large bowl until well blended. Beat in chocolate mixture. Spoon filling into crust; smooth top. Cover and refrigerate at least 6 hours and up to 2 days. Serve chilled.
Preparation Combine bittersweet chocolate, cream and unsweetened chocolate in heavy medium saucepan. Stir over medium-low heat until melted and smooth. Cool to just lukewarm. Beat next 3 ingredients in large bowl until well blended. Beat in chocolate mixture. Spoon filling into crust; smooth top. Cover and refrigerate at least 6 hours and up to 2 days. Serve chilled.