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
Stick to plain cabbage, carrot, and onion only. Bagged mixes with red cabbage or herbs will change both the flavor and color.
Don't cut the sugar. It's what balances the vinegar and lemon juice into that signature sweet-tangy flavor.
Six hours in the fridge is the minimum, but overnight to 24 hours gives the best texture.
Some liquid pooling at the bottom is normal, especially after a day or two. Stir before serving, or strain off the excess if it bothers you.
Sensitive to raw onion? Start with slightly less than the recipe calls for the first time. You can always add more next time.