Turn your instant pot to sauté mode add ghee and sauté your onions till translucent. Now add all the spices and mix well. Cook for about 5 min. Now add your fish and coat well but be gentle with it. Fish is delicate. Now add the lid and cook under high pressure for 8 minutes. Then quick release. Now in a separate bowl temper your yogurt. You do this by adding a ladle full off hot curry to the yogurt and mix well. Now add this to your fish and let it thicken on the sauté mode for about 8-10 minutes. Squeeze the juice of 1/2 a lemon And garnish with chopped coriander. Serve with rice and or naan.