*Apple cider or apple cider vinegar can be used in this recipe. I have used both and can't tell much of a difference. Most of the time I use apple cider vinegar, though, because I always have it in the pantry.
Place all ingredients in a slow cooker. Stir to combine. Heat to 200 degrees F. Cook 4 hours. If sauce isn't desired consistancy remove lid and cook 1 to 2 hours longer. Stir occastional with a whisk. Bottle and store in the refrigerator.
*For a completely smooth sauce, puree in a blender until smooth. I have left it chunky and I have pureed. It's good both ways. When I pureed the sauce, I did so before cooking it.