Take chana dal and maa ki dal/ urad dal and wash them 4-5 times till water runs clear.
Now in a pressure cooker add both the lentils add 4 cups of water along with salt , turmeric and chili powder, onion and tomato masala and asafoetida. If you are using regular pressure cooker it will take 4-5 whistles of pressure cooker.
For making Lagar dal in Instant pot, follow same procedure as above and set the pressure cooker and timer to 20 minutes.
While lentils are pressure cooking you can make tadka or final tempering alongside.
Take a small frying pan and add generous amount of ghee, I used 2 tablespoon sometimes I use olive oil too but it tastes better if you use ghee (clarified butter).
When ghee melts reduce the heat to lowest add cumin seeds.
Add in chopped ginger and allow them to splutter for 30 sec.
Next add in slit whole green chillies, whole red chillies (both optional)
Stir once or twice and add coriander powder and garam masala powder.
Immediately add it to the cooked dal and mix well and let the dal simmer for 5 minutes on slow heat and serve with Nan/tandoori Roti or Parantha.