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Cover and cook on low heat setting 8 to 10 hours or until apples are very tender. Mash apples with potato masher or large fork. Cook uncovered on low heat setting 1 to 2 hours, stirring occasionally, until mixture is very thick. Cool about 2 hours. Spoon apple butter into container. Cover and store in refrigerator up to 3 weeks.

To make a slow cooker apple butter, cook the apples, cider, brown sugar, and spices on high heat (uncovered) for about 2 hours (or until soft). Then, puree them just as you would for the stovetop recipe.

Add white sugar, brown sugar, salt, cinnamon, nutmeg, allspice, and vinegar. Add a splash of water and mix well. Cover and cook on High until apples are starting to soften and release liquid, about 1 to 2 hours. Reduce heat to Low and cook, uncovered, until all the apple flesh is dissolved, or about 5 to 6 hours. Stir occasionally.

Reduce heat to medium-low, and continue cooking at a simmer until the mixture is very thick, about 25 minutes. Sterilize the jars and lids in boiling water for at least 5 minutes. Pack apple butter into the hot, sterilized jars, filling the jars to within 1/4 inch of the top.