Make the biscuit and leave to cool.
Cut into rectangles of the same size as your yule log mould.
Make the IVOIRE 35% mousse and pour into your yule log mold.
Place in the freezer until the mousse is completely frozen.
Make the JIVARA 40% mousse and pour over the IVOIRE 35% mousse, then put the log back in the freezer until completely frozen.
Lastly, make the GUANAJA 70% mousse and layer into your yule log.
Lay the biscuit over the top and freeze.
Once the yule log is completely frozen, turn out, decorate and leave to defrost for at least 6 hours in the refrigerator.
Serve this yule log straight out of the refrigerator.
There is no need to get it out in advance, as chilling helps to develop its many aromas.