Sift flour and cocoa into a large bowl. Mix in sugar

Add butter and combined water and eggs. Using a wooden spoon, blend until well combined.

Pour mixture into a greased and floured 18 x 28cm slab tin.

Bake in a moderate oven (180°c) for 40 - 45 minutes. Test with a skewer

Allow to cool in the tin for 5 mins. Turn onto wire rack to cool. Ice or dust with icing sugar.