Wash, rinse and pat dry all meat. In Instapot (on saute mode, medium heat), heat 4 tbsp of ghee and 2 tbsp of grapeseed oil. Once oil is heated, add the meat and saute for 10-12 minutes until meat changes color. Add the ginger and garlic paste, mix well and continue to saute for 5 minutes. Add the Haleem spice mixture (keep 1 tsp of the Haleem spice mixture aside as it will be added later on when oats are added), stir well to combine all the spices with meat and cook for 5 minutes.
While meat and spices are cooking, blend together the yogurt and fried onions to make a smooth paste. Add this paste to the meat mixture and mix well. Continue cooking in Instapot (saute mode) for additional 10 minutes.
Remove all excess water from lentils except about 1/2 cup and add to the meat mixture. Again, stir well to combine all added ingredients. Add 4 additional cups of water, stir well, change Instapot setting to Pressure cook (on high setting), properly close lid, set time to 25 minutes, press start and let cook. After the set 25 minutes, vent the Instapot (please follow directions and take caution)!
Once all steam is released, carefully open lid, remove all meat into glass bowl with slotted spoon (meat should be very tender) and set meat aside. Into Instapot mixture (lentils and spices), add 10 cups of water and blend well with hand blender until lentils are diluted. Change Instapot setting to Saute mode and add 5 cups of oats into blended/diluted lentil mixture. Mix very well, add Kosher salt to taste, 1 tsp Turmeric powder and remaining 1 tsp of Haleem spice mixture that was kept aside. Mix well. Add 1/2 cup grapeseed oil into Instapot mixture. Stir well, cover properly with lid and cook for 20 minutes (now on Saute mode).
While Haleem is cooking, and once the set aside meat has cooled, discard any bones (remove any meat before discarding bones), and shred all meat using a masher. As the meat should be very tender, this should not take too make effort. Set aside.
After the set timing of 20 minutes, carefully vent Instapot, wait until all steam is released, carefully remove lid and using hand blender again, blend lentils and oats mixture to desired consistency (I like a smooth consistency, but with some thickness and texture). The haleem will be further diluted with boiling water later on so don't worry too much if the consistency is thick at this point as it will be! Turn off Instapot.