You can use the freezer test to check if your Instant Pot strawberry jam is done and has reached the correct consistency. Before you start making the jam, place a small plate or spoon in the freezer. Once you think the jam is done, place a small spoonful of the hot jam on the cold plate or the back of the spoon. Let it sit for a minute or two to cool down. Push the edge of the jam with your finger. The jam is ready if it wrinkles and doesn't run back together. If it remains liquid, it needs to be cooked a bit longer.