Add the apple cider, brown sugar, lemon juice, and salt to the bottom of the pressure cooking pot and stir until well combined.
Place a fine mesh steamer basket in the bottom of the cooking pot.
Add the apple quarters to the basket.
Select High Pressure and 10 minutes cook time.
When the cook time ends, allow the pressure to release naturally for 15 minutes, then finish with a quick pressure release.
Carefully remove the steamer basket from the pressure cooker.
Run the apples through a food processor and blend until very smooth, then set aside.
Select Saute and allow the liquids in the pot to come to a boil, stirring frequently until reduced at least by half, about 15 minutes.
Return the cooked apple puree to the cooking pot and stir until smooth.
Continue to saute and stir until it reaches your desired thickness and color.