Melt the chocolate with 2/3 cup cream and liqueur, if used, in heavy saucepan over low heat or in the top of a double boiler over barely simmering water, stirring till smooth.
Cool to room temperature.
With an electric mixer, whip the remaining cream, sugar, and espresso till almost stiff.
Fold a small amount of whipped cream into the cooled chocolate.
Fold this mixture back into the remaining cream till smooth.
Spoon into 8-10 wine glasses or dessert bowls.
Chill at least one hour before serving.
Garnish with fresh whipped cream, strawberry, raspberry or orange slices.