Add coconut, roasted gram lentils, garlic, chili, cumin seeds, sugar, lemon juice and water to a blender and blend until you get smooth chutney. Add more water if needed to get to the desired consistency. Take out the chutney in a serving bowl.
Heat oil in a tadka pan over medium heat. Add mustard seeds and allow them to pop. Turn the heat off and then add asafetida/hing and curry leaves. Be careful as you add curry leaves as the oil may splatter.