Preheat oven to 180 degrees. Line a 9 inch springfom pan and grease well.
Melt the butter and chocolate till done.
Whisk in the cocoa powder till no lumps and allow to cool completely.
Add in the sugar and beat till combined.
Add one egg at a time, beating with every addition. Finally add the rest of the ingredients and beat well. The mixture will be thick and glossy.
Pour into the prepared tin.
Bake for 30-40 minutes till the top looks cracked.
Take out and allow to cool completely. Cut into small slices and serve with black coffee.