In a medium-size saucepan, combine the milk, sugar, cardamom, cloves, cinnamon, star anise, coriander seeds, nutmeg and dried chilli flakes and cook over a medium heat until hot. Remove the pan from the heat, whisk in the cocoa using a hand whisk, then leave to stand for 20 minutes.
Strain the spiced milk into a clean saucepan and reheat until just boiling. Add