Season the prawns with spices, lemon and oil.
Turn on the instant pot and select sauté.
Add oil, green chilies, ginger garlic paste and sauté for 1 minute.
Add onions and sauté for 3 minutes.
Add tomatoes, marinated prawns and water in the instant pot.
Close the lid of the instant pot.
Set instant pot to Manual at high pressure and cook for 4 minutes. Release the pressure quickly through steam vent.
Garnish with fresh coriander and serve.