In a large bowl mix all sauce ingredients together, and stir well.
Add frozen meatballs to an instant pot liner, and pour sauce over the top.
Place lid on instant pot and lock into place, set valve to sealing.
Cook on manual pressure for 10 minutes
Quick release pressure
Remove lid, and hit the "cancel" button, then hit the "saute" button
Cook on "saute" mode, stirring regularly, to reduce the sauce, cook until it reaches desired thickness, 5-10 minutes
Once desired thickness is reached for the sauce, remove from instant pot to serving dish, and garnish with toasted sesame seeds and green onions
Serve immediately over cooked brown rice.