In an electric mixer, add the egg yolks and sugar and beat on high until pale and creamy.
Combine the milk and cream in a large saucepan and add the bourbon, vanilla, cinnamon, nutmeg and anise. Bring to a boil. Remove from stove and scoop out the whole spices.
Carefully, with the mixer on low, pour the hot milk mixture into the egg and sugar mixture.
Mix until combined and transfer the nog back to your pot and onto the stove.
On medium heat, whisk the mixture until it starts to thicken. Choose your choice of thickness, remove from heat and leave to cool, refrigerate until use.
For the chocolate bark; simply melt the both chocolate bars, spread open on a baking tin and sprinkle with nuts, nougat and dried fruit. Place in freezer until use.
When you are ready to serve, pour your eggnog into glasses and dust with cocoa powder – serve with broken chocolate bark.