n n Add all purpose flour, coco powder and salt to a large bowl. Stir through flour mixture until combined well.n n In a large bowl, take yogurt and sugar. Beat on medium speed by using hand mixture until combined well.n n Then, add baking powder and soda and again beat on high speed until you see the bubbles. n n Then add oil and vanilla essence and flour mixture, mix together and beat on medium speed until well combined. If the batter is too thick then add little hot water (about 1/4 cup). n n Beat  for about 1 minute to add air to the batter.n n Prepare cak mould by buttering/greasing and lightly flouringn n Pour the cake batter evenly in the prepared cake pan. n n Put the cake mould inside the pressure cooker without whistle for 35 mints.n n Remove from the cooker and allow to cool in the pan for 15 minutes and then cut it.nn