Place all ingredients for the sauce in a high-powdered blender, and blend until smooth. Set aside.
Add all ingredients for the meatballs, except ghee, in a large bowl and mix until just combined.
Shape into bite-sized meatballs, about 1-inch wide.
Set the Instant Pot to SAUTÉ and add ghee.
When the Instant Pot indicates that it's "hot," add the meatballs in a single layer without overcrowding (you may need to do this in 2-3 batches). Brown for 2-3 minutes, then flip when the meatballs lift easily from the pot without sticking. Repeat on the other side. They just need to be browned on two sides.
Remove the meatballs and set aside.
Add the blended sauce then scrape the bottom of the pot to deglaze. Turn off the Instant Pot.
Add the meatballs back in, then close the lid making sure the pressure valve is set to sealing.
Cook on MANUAL for 3 minutes, then release pressure immediately after it beeps to a finish.
Serve immediately, or leave in the Instant Pot on WARM until ready to serve. Garnish with chopped green onions before serving, if desired.