1. Layer in the slow cooker
Place the ribs in a single layer inside the slow cooker (stack gently if needed).
Combine the butter, brown sugar, and apple cider vinegar until blended, then pour the mixture evenly over the ribs.
2. Cook slowly
Cover and cook on LOW for 7–8 hours or HIGH for 4–5 hours.
The ribs are ready when they are very tender and easily pull apart with a fork.
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