Chop the vegetables very fine: the cabbage, carrots, and onions are all chopped very fine, almost like the size of rice. You can chop them with a sharp knife, or if you have a food processor with a shredding attachment, use that and then finely chop with a sharp knife. (See note about using a pre-shredded coleslaw mix.)
In a large bowl, combine all the ingredients for the dressing. Whisk until smooth.
Add in cabbage, carrots, and onion; mix well until everything is thoroughly coated.
Cover and refrigerate overnight. (If you have time - and can remember! - stir it occasionally. This will give you the absolute best results.) Stir again before serving and enjoy!
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Notes
You can buy a bag of pre-shredded coleslaw and finely chop that, if you prefer. But keep in mind that true KFC Coleslaw only contains green cabbage, carrots, and onions, so don’t use the packaged cabbage that has red cabbage or any herbs.