Take a thick bottomed pan and add coriander seeds. Dry roast until the raw smell is gone. Set aside to cool.
In the same pan, add split red gram, split chickpeas, black gram, cumin seeds and fenugreek seeds. Dry roast until the raw smell is gone. Set aside to cool.
Dry roast mustard seeds, till they splutter. Add them to the mixture.
Add in the curry leaves, black pepper and 20 dry red chillies. Dry roast them as well.
Add in turmeric and asafoetida and roast them for 2-3 min.
Transfer all the dry roasted ingredients to a blender and ground to fine powder.
Store in air tight container.