Sift together the dry ingredients for the base.
Melt the butter in a mixture of the milk and vanilla essence and beat into the dry ingredients.
Turn into a deep ovenproof dish or heatproof pudding-bowl.
Mix together the sugar and cocoa powder for the sauce and sprinkle over the base.
Then pour on the milk — but don't do a thing to make it look attractive.
Simply bake it at 180°C/350°F/Gas Mark 4 for 60 minutes, by which time a wonderful sponge will have emerged through that primeval-looking mud mixture you put on top.