Wash and soak channa and urad dal separately for an hour atleast in warm water. Soaking is optional but recommended.
Bring a wide heavy bottom pan to medium heat. Add sesame seeds and roast them till they become slightly brown and start crackling and popping. Set aside on a large plate.
Roast curry leaves till the leaves become crisp and shrink in size. Set aside.
Pat dry urad dal with a kitchen towel. Add a tsp of oil and dry roast on medium flame till it becomes golden brown. Set aside.
Pat dry channa dal with a kitchen towel. Add another tsp of oil in the pan and roast channa dal on medium flame till it becomes golden brown.
Now roast dry red chilies till you get a pungent smoky aroma from chilies. Set aside.
Next add mustard seeds and roast them till they start crackling and popping in the pan.
Once everything is well roasted, put it all in a blender. Add salt, asafoetida (hing) and grind well. Grind in intervals of some seconds to a coarse powder.
Cool down podi and add it to an airtight glass or steel jar. This powder will easily last you 3 to 4 months.