Combine chocolate, sugar, 1/2 cup water and coffee in saucepan.
Cook over low heat until smooth, stirring constantly.
Add vanilla; cool to room temperature.
Blend 3/4 cup chocolate mixture into pie crust; divide into 6 equal parts.
Press each part over bottom of inverted 8-inch cake pan to within 1/2 inch of edge.
Bake at 425 degrees for 5 minutes.
Lift off carefully.
Whip cream until stiff peaks form; fold in remaining chocolate mixture.
Stack crusts on plate, spreading cream mixture over each layer and on top.
Chill for 8 hours or overnight.
Garnish as desired.