You will need:
1/2 cup of cocoa
1 cup boiling water
1 + 3/4 cups of flour
1 + 1/2 cup sugar
3 teaspoons of baking powder
1 teaspoon vanilla essence
1/2 cup cooking oil
Pour 1 cup of boiling water into a jug with 1/2 cup of cocoa powder
Mix the flour, sugar and baking powder together. Make a well in the centre and add the cocoa mixture, vanilla, 4 unbeaten egg yolks and the oil and mix well.
Fold in stiffly beaten egg whites
Pour mixture into cake tins and bake at 180deg for an hour.
Test the cake with a skewer to see if it's cooked before removing from the oven. If there is batter on the skewer then leave a little longer :-)
Cool on drying rack and I love jam in the middle with icing sugar sprinkled on top.