Melt the chocolate with 3 tablespoons of the milk. Don't overheat. It should be lukewarm. 60 seconds in the microwave should do it. (30 seconds at a time)
Mix the sugar and cornflour with a little of the remaining milk and stir well.
Pour the rest of the milk into a saucepan and bring to the boil. Pour a little into the cornflour and mix together. Pour the cornflour mixture into the saucepan and bring it back to the boil, stirring continuously.
Blend the chocolate into the mixture and take off the heat. Stir well, pour into a serving dish or a few ramekins and leave to cool.
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