Roast the peanuts in medium flame for 5 minutes till it turns crispy. I roasted in microwave high power for 3 minutes. Rub the skin and take the groundnuts in a plate.
In a kadai, heat oil and saute the red chillies, green chilli, tomatoes until tomato turns mushy. Lastly add the roasted peanuts, tamarind and salt. Switch off the flame and let it cool. Grind it to a smooth paste adding water.
Temper mustard seeds, hing & curry leaves. Add to the chutney ! Serve with idli, dosa.
Video
Notes
Add more chillies if you like spicy chutney.
I sauteed the green chillies too. But the original recipe called for using raw chilli.
For variations, you can add one chopped onion, 3 garlic cloves. Saute in oil and grind. It gives a different flavor and taste.