In a sauce pan, add a little water and let it heat up. As the water starts boiling, place in another bowl on top of it and add 140 gm of dark chocolate and some butter. Gently melt the chocolate and butter mixture. Once melted completely, keep it aside for a few minutes to cool down.

In the meanwhile, heat up the cooker, by adding the salt. Place a wire stand on top of salt and a perforated plate above the stand. Cover the cooker by removing the gasket and the whistle. Heat the cooker in medium high for about 10-15 minutes.

As the chocolate batter as cooled little, add the cocoa powder, condensed milk followed by milk and mix it well.Finally, add the powdered sugar and maida to the mix. And, a little bit of baking powder. Mix it really well by using the fold technique.

As the batter is ready, add it to a square cake tin covered with parchment paper. Sprinkle some walnuts on top

Bake it by placing it on the heated cooker. It shall take about 25- 30 minutes in medium flame.

Take them out and let them cool completely cut in square pieces and serve...