firstly, in a blender take 1 cup coconut, 3 green chilli, small ball sized tamarind and ½ tsp salt.
add in ¼-½ cup water as required depending on variety of coconut used.
blend to smooth paste adding more water if required.
now prepare the tempering by heating 2 tsp oil.
add in 1 tsp mustard seeds, ½ tsp urad dal, 2 dried red chilli and few curry leaves. allow to splutter.
finally, pour the tempering over coconut chutney and serve with idli, dosa or rice.