First make the
ganache: put the cream in a saucepan, bring to the
boil, then stir in the chocolate until smooth.
Remove 2 tablespoons of the mixture and set aside.
Leave the mixture to cool, whisking occasionally to
prevent a skin from forming. When cool, whisk
throughway and beat in the softened butter.
Slice the sponge
into three layers. Sprinkle the bottom layer with 2
tablespoons of the Grand Marnier, if using, and
spread with one-third of the ganache, then put the
second layer on top.
Sprinkle with
Grand Marnier and spread with ganache as before,
then add the third layer of sponge. Sprinkle with
the remaining Grand Marnier, then spread the
remaining ganache all over the cake.
Place a tiny
amount of ganache into a piping bag and pipe an
abstract design on top of the cake. Dust with cocoa
powder. Coat the sides in chocolate strands and
place in the refrigerator to set for 10-15 minutes.
Put the reserved
chocolate cream in a piping bag and fill in the
abstract design. Decorate the cake with chocolate
curls and fruit.