Put cooking oil in pan and heat it.
Add 1 teaspoon cumin seed and roast it until it color changes to light brown.
Add chopped onions and green chilies and roast it little until its color changes to light brown.
Add 1/2 teaspoon kala namak, 1/2 teaspoon black pepper powder, half teaspoon red chilly powder, salt according to taste. Mix all ingredients very well.
Turn off the gas stove and remove it from gas. And put it on a bowl and let it rest until it cools down.
Now add whisked yogurt in it and mix it well.
Garnish it with coriander leaves and serve it.