firstly, in a large bowl take 1 cup oil, 1½ cup buttermilk, 2 cup sugar and 1 tsp vanilla extract.
using the whisk mix well until the sugar dissolves completley.
place a sieve and add 2 cup maida, 1 cup cocoa powder, ¼ tsp baking soda, 1 tsp baking powder, ¼ tsp salt and 1 tsp coffee powder.
sieve the flour making sure there are no lumps.
using a spatulla, mix gently using cut and fold method.
if there are still lumps in batter, then with the help of whisk break gently.
prepare a smooth lump free batter adding water if required.
to prepare the cake in a pressure cooker add in 2 cup of salt and close the lid of cooker without keeping the gasket and whistle. heat for 5 to 10 minutes. as a result, gives a preheat oven atmosphere.
now transfer the cake batter to a cake mould (dia: 7 inch, height: 4 inch). make sure to line a butter paper at the bottom to prevent from sticking.
and also tap twice to level up uniformly and remove any air bubbles if present.
place the cake pan into preheated cooker.
cover and cook on a medium flame for 55 minutes. you can alternatively, preheat and bake at 180-degree celsius for 55 minutes.
insert a toothpick and check if the cake has baked completely.
cool the cake and then unmould the chocolate cake.