Chocolate Mousse

Directions

1. 1
   In the top of a double boiler set over simmering water combine the chocolate and the espresso.
2. 2
   Heat the mixture, stirring, until just melted.
3. 3
   Remove the pan from the heat and whisk in the butter, a little at a time, until smooth.
4. 4
   In a bowl with an electric mixer beat the yolks with 2/3 cup of the sugar until the mixture ribbons.
5. 5
   Beat in the coffee-flavored liqueur.
6. 6
   Set the bowl over a pan of gently simmering water and beat for 3-4 minutes, or until mixture is foamy and very hot to the touch.
7. 7
   Beat over cold water for 3-4 minutes until mixture is cool and forms a ribbon.
8. 8
   Mixture should have consistency of mayonnaise.
9. 9
   Whisk yolk mixture into chocolate mixture.
10. 10
    In a bowl with an electric mixer beat the cream with the remaining sugar until it is firm but not dry.
11. 11
    Stir one-fourth of the whipped cream into the chocolate mixture and gently but thoroughly fold in the remaining whipped cream.
12. 12
    Transfer the mousse to a serving bowl, serve immediately or chill it, covered, briefly.
13. 13
    Serve with Creme Anglaise or whipped cream.
14. 14
    Drink: Coffee