Put the raisins and rum in a small saucepan. Warm over a gentle heat for a couple of minutes, then remove from the heat and stir it the orange zest. Leave the raisins to soak in the rum for 30 minute
Melt the chocolate in a bowl suspended over a pan of simmering water (make sure the base of the bowl doesn’t touch the water), the leave to cool a little; don’t sk