Peel, core, and roughly chop the pears. Add pears to an Instant Pot® along with ¼ cup water, juice of the lemon, granulated sugar, brown sugar, ginger, vanilla, cinnamon, nutmeg, and salt.
Seal and set Instant Pot® to high pressure. Cook 50 min. Let naturally release for 10 min.
Let pear butter cool slightly. With an immersion blender, carefully purée pear mixture until smooth. Change Instant Pot® setting to sauté, add the cornstarch, and simmer 4–6 min., until thickened. Let cool completely. Allow to set for at least 1 hour in the refrigerator. Keep refrigerated and enjoy up to 7 days.
