Use bottled apple cider vinegar labeled 5% acidity. Do not reduce the vinegar for canning safety.
Apple sauce can be substituted for apple butter, but the sauce will lose some of its cinnamon-spiced depth.
The sauce thickens slightly more as it cools. Expect 2-4 cups of reduction during simmering.
Hickory liquid smoke works well, but you can use your favorite liquid smoke.
For a smoother sauce, blend with an immersion blender before filling jars.
Brown sugar can be used instead of granulated sugar. If using brown sugar, reduce the molasses to 1/4 cup if desired.
Properly processed jars store for 12-18 months, or according to manufacturer recommendations for best quality.
Once opened, refrigerate and use within 2-3 weeks.