First of all, cut watermelon in pieces. Make very small pieces and keep them separate. Now add sugar and roohafza to the watermelon and grind it in mixture jar until it gets frothy.

Now, add soda or sparkling water or cold drink. I used Sprite. Now add black salt, salt and cumin powder. Mix well

Now, add small pieces of watermelon at the base of the glass. Pour the juice and add some more pieces of watermelon. Serve cold.