Make sure you have all the ingredients handy: chana dal, urad dal, toor dal, yellow mung, salt, red chili powder, cumin seeds and asafetida (hing).
Roast chana dal for 2-3 minutes in a pan on medium heat.
Now add tur dal, yellow mung, urad dal and roast for for 3 to 4 minutes (you can also add cumin seeds here; roasting cumin seeds is optional).
Allow roasted ingredients to cool for about 3-4 minutes and transfer them to a spice blender jar. If you have not roasted cumin seeds, add them to the jar along with salt, chili powder and asafetida.
Blend to an almost fine powder and transfer to a bowl.