Coat 2 liter
(8 cup) ovenproof dish with cooking oil spray. Sift flour, caster sugar
and cocoa into large bowl; add combined milk, essence and butter, stir
until smooth. Pour mixture into prepared dish; sift combined brown sugar
and extra cocoa evenly over top.
Carefully
pour hot water over pudding. Bake, uncovered in moderate oven about 50
minutes or until pudding is firm. Serve dusted with sifted icing sugar,
if desired.