If you will be using pectin, refer to the instructions on the package before beginning this recipe.
Wash the strawberries and pat dry with a paper towel. Then remove the stems/leaves.
Dice the strawberries.
Add the strawberries to the pot. You will not need to add any liquid as the berries will release plenty.
Add the sugar. Do not stir!
Close the lid and set the steam release knob to the Sealing position.
Press the Pressure Cook/Manual button or dial, then the +/- button or dial to select 1 minute. High Pressure. The pot will take several minutes to come to pressure.
When the cook cycle has finished, turn off the pot and let it sit undisturbed for 15 minutes (15 minute natural release), or until the pin in the lid drops back down by itself.
When the pin in the lid drops down, open the lid.
Turn on the Sauté setting. Choose the Less/Low heat setting.
Stir in the lemon juice.
Let the mixture simmer for about 5 minutes, stirring frequently, until the jam thickens.
Optional: You can mix together the corn starch and water and stir it into the simmering jam to thicken it. This yields a thicker jam.
Transfer the jam to clean canning style jars with lids and keep in the refrigerator for up to 2 weeks. Yields about 1 pint.
If you want to can this jam, please refer to the canning jar manufacturer's guidelines for safe canning. The Instant Pot does not can.