Using a mortar and pestle, lightly crush the cardamom, cloves, peppercorns and star anise (alternatively, leave them whole).
Transfer the crushed spices to a saucepan and add the ginger, licorice root (if using) and 3 cups water. Bring to a boil, then reduce the heat and simmer for 4 minutes.
Take the saucepan off the heat and let steep for 4-5 minutes. Add the milk and rooibos tea and bring back to a boil.
Remove from the heat, cover and steep for another 5 minutes. Strain and serve.
Recipe Notes
Recipe and photo from I Quit Sugar by Sarah Wilson. Published by Clarkson Potter, a division of Random House LLC.