Peel the skins of mangoes and banana and cut them into cubes.
Finely chop all the other fruits. If you are using any frozen kind, let them thaw to room temperature for at least 10 minutes.
In the inner pot, put the chopped fruits, ½ cup sugar, and ½ cup pineapple juice, cardamom pods. Close the lid and set the pressure valve to the sealed position and set the timer for one minute.
Release pressure naturally for at least 15 minutes. DO NOT flip the pressure valve.
Release the pressure valve carefully and remove the lid.
Using a hand blender or a masher, blend/mash the mixed fruits until all the fruits chunks disappear.
Turn Instant Pot to 'saute' function and allow the mashed fruits to come to a simmer/boil.
In a small bowl combine two tablespoons water with 1 teaspoon cornstarch. Slowly pour this into the fruit mix and stir well. ( if you want to skip the cornstarch, boil another 10 min)
Let it simmer for 5 minutes or until the mixture thickens.
Turn the instant pot off and allow mixture to cool down.
Mixed Fruit Jam is ready! Store it in a dry mason jar and refrigerate!