Discard the outer leaves of the purple cabbage, quarter it, cut out the stem, and then slice into thin shreds.
1 small head purple cabbage
Put the shredded purple cabbage in a bowl, add one tablespoon of salt, and toss to coat.
1 tablespoon salt
Put the cabbage in a strainer and let drain for 15 to 30 minutes. Discard any water that drips off, or use it to make purple rice!
After about 15 to 30 minutes, rinse the cabbage in the sink to remove the salt and dry it in a salad spinner or, alternatively, with some paper towels.
Add all of the ingredients for the coleslaw dressing in a clean glass jar and shake hard to emulsify.
¼ cup extra-virgin olive oil, ¼ cup cider or white wine vinegar, 1 tablespoon brown sugar, 1 tablespoon Dijon mustard, ¼ teaspoon ground black pepper
Add the now-dry cabbage, shredded carrots, green onion if you are using it, and chopped cilantro to a bowl, and add only enough of the coleslaw dressing to coat the cabbage well. Taste and adjust the salt and pepper, as desired.
1 medium carrot, 1 green onion, ¼ cup cilantro