Slice the apples or cut them into pieces. Discard the core, stem and seeds.
Add butter, apples, lemon juice, cinnamon and water to the Pressure Cooker. Stir it all up. Close lid.
Start the Pressure Cooker on manual or pressure cook mode at high pressure for 4 minutes. Once the pressure cooker beeps, let the pressure release naturally.
If using Cinnamon stick, remove it from the pot. Use an immersion blender or blender to smooth the applesauce to the consistency you prefer. Be careful if blending when the apples are still hot.
Let it cool, then place in air tight containers to store in refrigerator. Enjoy!