Soak dry red chillies in hot water in a bowl. Set aside for 10 minutes.
Heat oil in a pan and roast some garlic in it.
After a while, add some onions and saute well. Let them turn golden brown.
Once the mixture cools, transfer it to a blender. Add a little tamarind, salt, and soaked red chillies to the blender.
Blend it to make a smooth paste. Add some water as well if required.
Heat some oil in a pan and add mustard seeds, urad dal, hing and curry leaves.
Pour the red chutney paste into the pan. Cook it for a minute or two.
Enjoy the delicious Poondu or red garlic chutney with dosa or idli.