Heat 1-1/2 to 2 cups of water in a bowl to lukewarm temperature and add peanuts to it. Close with a lid and let it soak for 30 minutes.
After 30 minutes, transfer the peanuts along with the water to a pressure cooker and more water till the peanuts are completely covered.
Add salt, mix well and pressure cook for 2-3 whistles.
After the pressure is released, drain the water completely and keep aside.
Heat a pan with oil. Add mustard seeds and let it splutter.
Add broken whole dry red chilies, asafetida, curry leaf and give it a stir.
Add boiled peanuts and toss well.
Take the pan off fire and add grated coconut.
Toss well so that the coconnut gets mixed well with the peanuts.
Peanut sundal is ready.
Serve hot or warm.