In a bowl, beat all six eggs with electric hand mixer and gradually add sugar until light and creamy. Add oil, vanilla essence and mix well. Mix sifted flour, baking powder and salt and fold into the egg mixture. Add a little milk at a time if it's too stiff until its a pouring consistency. Put half of the mixture in another bowl and add cocoa powder. Mix it well until mixture is chocolatey.

Grease a round baking tin with oil and dust with flour. Prepare two clean spoons. First put a spoon of vanilla mixture in the centre of the baking tin. Then use a seperate spoon and put the chocolate mixture in the centre of the vanilla one. Keep alternating the mixtures, it will keep on shifting until it's half full. Bake at 180 degrees C for 35 minutes. ENJOY