Add all the ingredients for chutney into a blender jar – coconut, ginger, green chili, walnuts, mint, cilantro, lemon juice, and salt to taste.
Add water as needed to blend the chutney to a smooth consistency.
Remove the chutney into a serving bowl.
Prepare the tempering. Heat oil in a pan.
Add mustard seeds, and let the seeds splutter.
Reduce the heat to low and add urad dal, asafoetida, dried red chili, and curry leaves. Sauté for a minute or until dal turns light brown.
Turn OFF the heat and add the tempering over the chutney. Mix well.
Enjoy Walnut coconut chutney with some Nav Dhan Masala Dosa (no rice dosa), or Quinoa Idli (no rice idli)!