First dry roast peanut in medium flame with frequent stirring until it gets roasted thoroughly. Most of it crack opens and skin comes off easily. Remove in a plate for cooling.
In the same kadai, add 1 teaspoon oil. Splutter mustard, add urad dal. Roast it until crisp and add curry leaves.
Remove in a serving bowl, set aside.
Add another teaspoon of oil. Roast asafoetida, red chilli and ginger. Remove in the plate for cooling down.
Tip in cubed tomatoes and tamarind. Roast until the tomatoes turn soft. Transfer to the plate for cooling.
Once completely cooled, grind all the items with required salt, really smooth.
Transfer to the serving bowl with tempering. Add required water.
Mix well to serve.