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Toast the cardamom seeds and star anise in a frying pan over a low heat for 1–2 minutes.
Stir in the chilli flakes, orange zest and cinnamon.Cook for another minute, until the orange zest starts to dry out.
Place the spices into a mortar and grind with a pestle until it turns into a fine powder.
Put the broken chocolate pieces, ground spices and milk into a pan and slowly bring to the boil, stirring all the time. Heat until the chocolate has melted and the liquid is hot.