Take all-purpose flour, cocoa powder, baking powder and salt in a bowl and sieve it. Preheat oven at 180 degree for 10 minutes.

Add sugar to melted butter or oil and mix it very well. In another bowl, add yoghurt with one tablespoon of water and whisk it well. Now add vinegar and baking soda to the yoghurt mixture and whisk it so that the foam will appear.

Now in the flour mixture, add yoghurt mixture, sugar mixture, orange juice, orange zest and orange essence. mix everything very well. Mix everything quickly to make a smooth and lump free cake batter.

Pour prepared batter in a greased baking tin and tap the tin lightly so that air bubbles will come out. Now bake the cake at 180 degree for 35 to 40 minutes. Check with the help of a knife if the cake is done or not. If the knife comes out clean, the cake is ready otherwise it needs to be baked for a few more minutes.

Let it cool down for 20 to 30 minutes at room temperature. Now take it out from the tin and put it on a wire rack so that it does not become soggy. Cover the cake with thick cloth and let it get completely cool for 5 to 6 hours.

While the cake is cooling down, prepare chocolate ganache. Chop chocolate compound into small pieces and put it in a bowl. Now add cream to a heavy bottom pan and bring it to a boil. Now pour the cream to the bowl with the chocolate and let it sit for 1 minute. Now with the help of a spoon gently stir it until everything is mixed completely. Our beautiful shiny chocolate ganache is ready. No let it cool down completely and then keep it in the refrigerator until needed.