To make the sponge pudding put the butter and sugar in a food processor and blend.
Add the eggs, flour and vanilla essence and blend again.
Butter a small pudding dish and add the crumbled chocolate, cookies and then top with the pudding mixture.
Cover with cling film and cook on high in the microwave for four minutes.
To make the chocolate sauce, put the water in a small pan, add the cocoa powder and sugar and reduce to thicken it.
To serve, place the pudding upside and turn out. Drizzle the sauce over and serve with ice cream.