Preheat oven to 180°C (350 ˚F / Gas mark 4).
Lightly grease an 8-cup capacity ovenproof bowl or pudding bowl.
Sift flour and 2 tablespoons cocoa into prepared bowl. Stir in ½ cup sugar with milk. Stir until well combined.
Combine remaining ½ cup sugar and 1 tablespoon cocoa in a small bowl. Sprinkle over surface of pudding.
Gently pour boiling water over the back of a large metal spoon to cover surface of pudding. Dot with butter.
Bake for 35 to 45 minutes or until a skewer inserted into the center comes out clean.
Dust with icing sugar and serve with ice-cream.
Serving Size 4 - 6 people