Marble cake

Ingredients
8oz butter
8oz caster/superfine sugar
3 eggs
few drops of vanilla extract
10oz self raising flour sieved
3oz plain chocolate
(see measure conversions for more information)

Method
Cream the butter and sugar until light and fluffy.
Add the eggs and the vanilla essence with a little flour.
Fold the flour into the mixture.
Divide the cake mixture between two bowls.
Melt the chocolate in a bowl over a pan of hot water and add to the cake mixture in one of the bowls.
Drop alternate spoonfuls of plain and chocolate cake mixture into a well-greased 7 inch round cake tin.
Bake at 180 degrees C. for 45 minutes.
Remove from tin and cool on a wire rack.