First preheat the cooker using salt

In a bowl add milk and vinegar keep it side for five minutes

In a mixing bowl sieve all porpuse flour baking soda and baking powder mix it very well

Put sugar and butter in buttermilk mix it very well in one direction now add all purpose flour and mix it very well

Put two tbsp of cocoa powder in another bowl add one fourth cake batter in it add two tbsp milk and mix it very well

Now grease the cake tin with oil and spread butter paper in it put the half cup white cake batter now add chocolate cake batter afrer that put rest of the white cake batter swirling the cake batter with table knife

Cook it in low medium heat for 55 minutes

After 55 minutes cake is ready cool it competely serve it with tea in the evening