Throughly wash the lentils and rice, keep them soaked in water until ready to mix with other ingredients.
In a pot of an instant pot on a saute mode heat the oil, add peanuts and roast them until light brown. Now add asafetida along with cumin and mustard seeds and let the seeds crack.
Stir in curry leaves and onions, let them cook for 5 minutes; until soften.
Next add tomatoes and other veggies along with pinch of salt. Mix and cook for another 5 minutes.
Add the spices (turmeric, red chili, coriander and sambhar powder) to the veggies and give it a nice stir.
Stir in rice, lentils and lemon juice along with water enough to cover everything and an half an inch above. Adjust salt, close the lid and on pressure cook mode cook for 12 minutes.
Let the instant pot depressurize naturally.
For the tadka, heat the ghee in a saute pan and roast the cashews until light brown. Add urad and chana dal, pour the ghee mix over cooked rice and give it a big stir.
Enjoy warm with fried pappdum.