Chocolate Mousse Pie

Directions

1. 1
   Melt the chocolate over hot water.
2. 2
   Blend in coffee and liqueur.
3. 3
   Add egg yolks, one at a time.
4. 4
   Stir in vanilla and cool slightly.
5. 5
   Beat egg whites with cream of tartar until soft peaks form.
6. 6
   Add sugar; beat until stiff and not dry.
7. 7
   Gently fold egg white mixture into chocolate mixture.
8. 8
   Turn into crust; freeze until firm.
9. 9
   Top with whipped cream when serving.