To the ground paste, add powdered rock salt, asafoetida, chopped onions, mustard seeds, cumin seeds and mix well.
Add 5 to 6 tbsp castor oil and grease both your palms also to prevent the mixture from sticking to your hands.
Mix well making sure that the oil coats all of the mixture. Add more oil if the mixture is way too dry.
Make small balls the size of a gooseberry.
Spread a clean plastic sheet on the terrace and arrange the rolled balls one next to the other.
Let the balls dry out under direct sunlight for at least 3 to 4 days.