Place the apples in a 7-quart slow cooker and add the remaining ingredients. Give it a gentle stir. Cook the apples on the “low” setting for 20 hours, giving the mixture an occasional stir after the first few hours of cooking.
After 20 hours, use a [url:1]blender stick [/url]to puree the apple butter until smooth. Continue to cook, now with the lid open, for the remaining 4 hours to allow the apple butter to further thicken. Depending on how juicy your apples are, you may need to cook it a bit longer until the desired consistency is reached. At this point, taste and add more sugar if desired.
If you'd like to store your apple butter long-term, it's super easy to can it! This water bath canning set has everything you need. While the apple butter is still hot, ladle it into hot sterilized jars, leaving 1/4 inch headspace, and process the jars in a water bath for 15 minutes. The apple butter will store in a dark, cool place for up to a year.
Alternatively, freeze or store in the fridge in air-tight jars for at least a month.
Makes about 5 pints.