Chop tomatoes.
Heat pan, dry roast peanuts till the aroma comes out or they turn into brown color.
Roast them in low to medium flame.
Do not burn them, otherwise the chutney tastes a bitter.
Once they are fried, keep them aside.
Heat oil in the same pan, add mustard seeds and urad dal.
Fry them till they splutter. Keep them aside.
In the same kadai, heat oil, add red and green chillis.
Sauté them for a while and switch off the flame. Keep it aside.
Again heat little oil in the same pan, add chopped tomatoes.
Cook till they become soft.
In a blender jar add roasted peanuts, tomatoes, green and red chillis.
Add salt and tamarind.
Blend it to make smooth chutney while adding required amount of water.
The chutney should be thick and porous.
Temper it with the seasoning of mustard seeds and urad dal.
Serve tomato peanut chutney with dosa or idli.