Sift the flour,keep aside. In a bowl add eggs,essence and beat until it truns foamy. Then add sugar and beat for 5 minutes and the mixing will become thick.

Now u can add oil and beat for 30sec.
Now add the sifted flour and mix,also add milk little by little. It's not necessary to add the whole part of milk. Its enough to use how much u need to mix the the flour. It takes 3tbs of milk,here.

Now divide the batter into 2parts. 1part in white in colour. Another part,add sifted cocoa powder and mix gently.

Now,pour 1/8th cup of white colour batter and brown colour batter alternatively in a oil rubbed loaf tray. Do the process until we use whole the batter. Use a stick and draw lines on it. Finally, it will look like zerbra lines.

In the mean time,pre heat the tawa around 10 mins,and place the tray inside the tawa and close and cook around 50mts.