To a medium saucepan (see notes for Instant Pot instructions) add peeled chopped apples, cinnamon, a dash of water (~2-3 Tbsp / 30-45 ml as original recipe is written), and lemon juice or apple cider vinegar. Stir.
Cover and cook over medium heat until it simmers, then reduce heat to low / medium-low and continue cooking until the apples are very tender and slightly caramelized — about 15-20 minutes. Stir occasionally.
Use the back of a wooden spoon or potato masher to mash into a loose sauce. You could also blend with an immersion blender, in a food processor or high-speed blender for smoother texture (optional) – a helpful step if you left the skins on. Add a dash of maple syrup or sugar of choice to sweeten (optional – depends on sweetness of your apples).
Enjoy fresh, or store cooled leftovers in the refrigerator up to 4-5 days, or in the freezer up to 1 month. Enjoy cold or reheated in the microwave or on the stovetop over low heat until hot (add more water as needed if dry).
*To prepare in Instant Pot, add all ingredients to inner pot and pressure cook on high for 8 minutes. Once timer goes off, carefully quick release pressure. Use the back of a wooden spoon, potato masher, or immersion blender to mash into a loose sauce. If there is too much liquid, turn on the sauté mode and stir frequently to encourage evaporation (cover with the lid if there's splattering). Press cancel when desired consistency is reached. *Nutrition information is a rough estimate.