Grind all the ingredients to a smooth paste with a little water. Adjust the thickness of the chutney with extra 2- 3 tablespoons water if you required.
In a pan, heat 2 teaspoon oil. Add mustard seeds. When they splutter , add remaining ingredients. Saute well. Pour this over to coconut chutney. Serve with dosa / polo, idli, vada, pongal, thattu dosa ....