Mix the flour, cocoa, baking powder, butter, sugar, water and vanilla and beat together.
Add the eggs and beat the batter smooth.
Transfer onto the baking tin.
Heat the pressure cooker, covered but without the pressure for 3-4 minutes on high heat, then place the cake tin in the empty cooker (do not add water in the cooker).
Cover again without the pressure, lower the flame and let cook till done (about half an hour).
Key Ingredients: chocolate, all purpose flour, sugar, vanilla essence, salt, butter, cocoa, baking powder