Grease and line the pan or pressure cooker with parchment paper, removing the gasket and whistle if using a pressure cooker.
In a large bowl, sift together flour, cocoa powder, sugar, baking powder, baking soda, and salt.
In another bowl, mix the vegetable oil, buttermilk, and vanilla extract.
Gradually add the wet ingredients to the dry ingredients, stirring until just combined and smooth.
Heat the stovetop or pressure cooker on low flame for 10 minutes to preheat.
Pour the batter into the pan, place it in the preheated pressure cooker or stovetop setup, cover, and cook on low heat for 35-40 minutes, checking with a toothpick for doneness.
Once done, remove the cake from the pan and let it cool completely on a wire rack before serving.
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