Chocolate Mousse Pie

Directions

1. 1
   Heat chocolate with water in saucepan over very low heat, stirring until smooth.
2. 2
   Stir in egg yolks; add vanilla.
3. 3
   Beat egg whites in large mixing bowl until foamy throughout.
4. 4
   Gradually beat in sugar until stiff peaks form, about 3 minutes.
5. 5
   Stir a small amount into chocolate mixture to lighten; fold chocolate mixture into remaining whites.
6. 6
   Pour 4 cups into a buttered 9-inch pie plate sprinkled with sugar.
7. 7
   Chill remaining mixture.