Steamed chocolate pudding

1) Cream the butter and 110g of the caster sugar until light and fluffy.
2) Blend 4 tablespoons of the cocoa powder with the hot water to a smooth cream and beat it into the creamed mixture.
3) Beat the eggs and gradually beat them into the mixture.
4) Sift the flour and fold into the mixture, mixing to a soft dropping consistency with 1 tablespoon of the milk.
5) Turn the mixture into a greased 1.2 ltr pudding basin, cover with greased foil or greaseproof paper, and tie on the covering with string.
6) Steam or boil the pudding for 1½ hours, adding more boiling water if necessary.
7) Blend the remaining cocoa powder with the cornflour, remaining sugar and a little of the remaining milk.
8) Heat the rest of the milk until it boils, then pour onto the cocoa mixture, stirring continuously.
9) Return to the pan and bring to the boil, stirring, and cook for a further 2 minutes, stirring frequently.
10) When the chocolate pudding is ready, turn out of its basin and serve with the chocolate sauce.