Press the saute function on the instant pot and add some oil and 2 tbsp butter.
Add the onions and turmeric. Cook for 1-2 minutes.
Stir in the garlic and ginger and cook for an additional 30 seconds.
Add the chicken, tomato puree, sugar, salt, and water.
Close the lid and press the pressure cooker function. Set the timer for 5 minutes.
Once the 5 minutes are up, move the steam valve slowly and slowly release steam. Open the lid carefully.
Press the saute function, add the heavy cream and cook for an additional 40 seconds.
Check for seasoning, add the remaining butter and garnish with fresh cilantro, if desired.