Blend sooji/rava in a blending jar for once to make sooji thin.
Now put the blended sooji in a bowl, add sugar and buttermilk.
Mix well until sooji absorbs the buttermilk. Add water if required to get cake batter consistency
Set aside for 5 mins.
Take Tuti Fruity and coat them with some maida/flour and mix in the sooji batter.
Add baking powder and baking soda in the batter and mix gently.
Add melted dark chocolate in the batter and bake it in oven for 25mins or until it cooks.
You can garnish before baking with some Raisins, cashews and almonds