- To grate the watermelon rind: cut the flesh (the pink part you normally eat) away from the white rind. Then cut the very thin layer of green skin off of the rind (it may be easier to use a peeler for the skin). Grate the chunks of white rind on a coarse box grater. Place the grated rind in a colander and press gently to drain some of the water (no need to go crazy and get all of the juice out).
- Combine the grated watermelon rind, bell pepper, carrot, green onions, and cilantro in a large bowl. Toss to combine.
- In a small jar, combine the apple cider vinegar, mustard, olive oil, and a pinch of salt and pepper. Shake to combine.
- Pour the dressing over the watermelon rind mixture and toss to coat. Enjoy!