First to a Kadai / Pan add oil and once hot add in dry red chillies. Allow the red chillies to darken a bit and quickly add in the onions.
Add salt and cook the onions until soft and little translucent. Then add chopped tomatoes and cover and cook for about 5 minutes on medium flame until the tomatoes go soft.
Then add the mint and coriander leaves, peanuts and switch off the flame.
Blend it to a smooth chutney (no need add water)
Serve it with rice and a drizzle of gingerly oil.
You can add little water and serve it as a side dish for dosa as well.