Add the halved strawberries, lemon juice and sugar to the instant pot.
Mix it and let it rest for 10-15 minutes, strawberries releases its juice by doing so.
Mash few strawberries with the potato masher.
Close the Instant pot lid and secure the pressure release valve. Select the “Manual” option and cook on high pressure for 1 minute.
Wait for 15 minutes to release the pressure naturally.
Remove the Instant pot lid, take 2 tablespoons of strawberry liquid from the Instant pot and combine 2 tablespoons of cornstarch and make it smooth slurry.
Add the cornstarch mixture to the instant pot and select “Sauté” mode.
Bring the mixture to boil and stir it frequently until the jam is thickened (it takes just 3-5 minutes)
Once done turn off the Instant pot and allow the jam to cool a bit.
Transfer the jam to an airtight container and store it in refrigerator and use when needed.