Heat a pan with a tsp of cooking oil, add red chilies, fry for couple of minutes. Then, add sesame seeds and fry for a couple of seconds.
Next, add the coconut and roast it all together till the coconut turns light golden. Let the mixture cool down.
Grind this spice mixture with tamarind, jaggery and about 1/2 cup of water. Grind everything into a very smooth paste adding more water if required.