Mix the onions, chillies and coriander leaves and crush in the salt with your hand.
Set aside for some time till the juices of the onion are released.
Mix in the tomatoes with a fork.
Whip the yoghurt and mix well.
Serve cool with biryani, pulao or even parathas.
To ensure creamy texture, add in the yoghurt not more than 10 minutes before serving.