In a small saucepan heat half the cream until it just starts to bubble. Remove from heat, add chocolate and coffee. Stir through until melted and smooth. Let cool. Put remaining cream into a metal bowl and add the cooled chocolate mixture to the cream. Whisk egg white until it starts to make points. Add sugar and whisk until soft peaks form. Fold into chocolate mixture. Place in a container or individual glasses. Refrigerate until set. Serve with shaved chocolate.