Mix the flour, sugar, cocoa, vanilla, and liquid ingredients to make the batter.
Pour the batter into a cake tin that has been greased and dusted with flour.
After taking off the whistle, preheat the pressure cooker for five minutes.
Put the cake tin on top of a stand that has been placed inside the cooker.
For 35 to 40 minutes, cook covered over medium heat without a whistle.
If a toothpick inserted into the cake comes out clean, it is ready.
Enjoy your wonderful pressure cooker cake after it has cooled and been decorated with frosting.