In a blender/mixer-grinder, add coconut, red chilies, garlic, roasted gram dal, tamarind, and salt.
Close the lid of the jar and blend them together using a little water at a time, until you get a smooth chutney of the desired consistency.
In a small tadka pan. Add oil, when it is hot, add mustard seeds, urad dal, dried red chili, a few curry leaves, and hing, and fry until the dal turns lightly golden.
Pour the tempering over the prepared chutney.
Mix well and serve the Red Coconut Chutney with dosa, idli.