01 -
Peel, core, and slice the apples. Add them to a 6-quart slow cooker.
02 -
Add the brown sugar, apple cider, lemon juice, cinnamon, nutmeg, cloves, and fine salt. Stir until the apples are evenly coated.
03 -
Cover and cook on low for 8 hours, stirring once or twice, until the apples are very soft, dark, and collapsed.
04 -
Blend the apples with an immersion blender until completely smooth. If using a countertop blender, blend in small batches and vent the lid carefully.
05 -
Stir in the warmed caramel sauce and vanilla extract until fully combined.
06 -
Cook uncovered on low for 45-60 minutes, stirring every 15-20 minutes, until the apple butter is thick and glossy.
07 -
Stir in the flaky sea salt. Taste and add a pinch more if needed. Cool slightly, then transfer to clean jars and refrigerate.