Take a big size 5 Ltr + Pressure cooker. Remove the whistle and the gasket(Ring).
If using nonstick, add a teaspoon of oil. Place a ring or a stand in the bottom.
Grease a 6-inch baking tin with butter. Line it with parchment paper (Optional).
Preheat the pressure cooker on medium. Induction hob - 6.
In a wide bowl sift the wheat flour, baking powder, baking soda, and salt.
In another bowl, melt the chocolate and add softened butter.
Add in water, lemon juice, and Vanilla Extract.
Now add the wet ingredients slowly to the dry and mix to form a lump-free batter.
Do not over mix.
Add the mixed batter in the prepared baking tin.
Place the cake tray inside the cooker on top of the ring or the stand.
Cover the cooker and let this cook on slow (Induction - 6) for a minimum of 60 mins (1 hour).
After 45 minutes, the cake is not yet done
After 1 hour open the lid and check if the cake is done, by inserting a toothpick or a skewer.
The cake is done when the toothpick comes out clean. If it is not done, bake it again in time intervals of 10 min on slow.