In a large mixing bowl, take all the dry ingredients- flour, sugar, cocoa powder, salt, baking powder, baking soda. Mix well and make sure everything is combined.
In another mixing bowl, whisk the eggs with vegetable oil, yogurt and vanilla essence. When thoroughly combined, very gently, pour the hot water through the side of the bowl and continue whisking. It will become frothy and rise.
Now make a well in the centre of the dry ingredients and pour the wet ingredients into it. using a spatula, gently fold everything together. If you want to use an electric mixer, use the lowest speed to combine everything thoroughly. The batter is quite a runny batter.
Take two 7 inch cake tins. Line them with butter paper or grease and dust them with flour. Pour the batter evenly in both the cake tins.
Plate in a pre-heated oven at 180 degrees c for about 30 minutes. Check with a skewer if the cake is done or not. The skewer should come out clean when pricked in the centre of the cake.
Once the cakes are done, take them out and let them cool down for about 10 to 15 minutes. Then take the cakes out of the cake tin and place them on a wire rack to cool down completely.