Beat the egg white until stiff, beat the egg yolk over steam with sugar and vanilla until creamy, add rum and beaten egg white, cool slightly. Whip cream with cream stiffener and fold in 5 crumbled meringue in a 26 cm form.
Put half of the cream on top of the meringue and the rest of the crumbled meringue. sprinkle the chocolate over the meringue, cover with aluminium foil and place in the fridge for 24 hours.