Add the shredded cabbage and sliced apples and onions to the slow cooker. Stir to mix them together.
Sprinkle in the sugar ground cloves, cinnamon, salt, pepper and butter; stir to combine.
Pour in the apple cider vinegar and water, stir well.
Cook on high for 3 hours or low for 5 hours.
When the time is up, open the lid and stir to dissolve the apples. Taste for salt and add more if needed to taste.
Replace the lid and cook on low for an additional hour or high for about 20 minutes.
Video
Notes
Adaptions and Variations:
Vinegar — You can substitute the apple cider vinegar for red wine vinegar, balsamic vinegar, or even white vinegar.
Apple — Braeburn, Fuji, golden delicious, or your favorite variety will work well. In a pinch you can even use apple sauce.
Sugar — Brown sugar can be swapped out for white sugar.
Onions — Use caramelized onions instead of raw onions. This will create a deeper flavor.
Water — Use chicken broth for added flavor as well instead of water. For even sweeter red cabbage, use apple juice.
Spices — Juniper berries are an ingredient used in the traditional recipes but can be hard to find. If you do find them, use 3-4. You can also swap the ground cloves for 3-4 whole cloves. I'd recommend adding them to a cheese cloth pouch or a empty tea bag. You do not want to bite into either of these and they could be hard to fish out after the dish is cooked.