Heat the 1 tsp oil in a wok or heavy skillet over medium heat for 3 minutes. Add the urad and channa dal and chiles. Fry stirring constantly until the beans begin to turn color, about 3 minutes.

Stir in the asafetida and sesame seeds. Continue frying until the contents of the pan are nicely browned and smell roasted, about 3 minutes. Turn off the heat, transfer mixture to a plate and cool completely. Blend in the sugar and salt. Grind the mixture to a powder using a coffee grinder , or a large mortar and pestle or spice mill. The powder should be neither course, nor as fine as flour.