Prepare a well greased and dusted baking tin.

In a saucepan add the cocoa powder sugar and water... cook for 3-5 mins. leave to cool.

Sieve the baking powder and flour together.

In a bowl mix the margarine and sugar until fluuffy and slightly turns from yellow to white. add the eggs one at a time beating properly between each addition.. add vanila essence.

Fold in the flour to the egg ad margerine mix. (can be added in 3 batches) the milk is added to correct the consistency of the mixture.

Pour 1/3 of the mixture into the well greased tin. divide the remaining into 1/2 and mix one portion with the cocoa mixture... add to the baking tin the top with the remaining white mixture. use a fork to fold through the mixture butdo not overdo it.

Put it in a cold oven at 180°c for 50 mins.