Finely chop the dark chocolate and set aside.

Preheat the oven at 180℃ for atleast 10 mins. Line the baking tray with butter paper or grease it with butter.

In a bowl sift together all purpose, cocoa powder, powdered sugar, a pinch of salt and baking powder. Mix well.

In another bowl cream the butter and curd together along with vanilla extract.

Add the dry ingredients mix. Add water and gently fold the dry ingredients with the wet ingredients. Add the grated dark chocolate and fold it in.

Pour the batter into the baking tray and tap it gently to avoid any air bubbles.

Set it in in the oven at 160℃ for 35 mins or until a tester inserted comes out clean.

Remove from oven and let it cool down. Invert onto a plate and cut equal parts.