First, add garlic, ginger, coconut, tamarind, Kashmiri chilli powder, and salt to a mixer jar. Pulse or crush well.
Add the ripe tomato and pulse again until combined. Do not over-grind.
Heat sesame oil. Add mustard seeds and let them splutter, then add urad dal and roast until golden.
Add the dried red chilli, curry leaves, and asafoetida. Pour the tempering over the chutney and mix well.