Thinly slice the red onions and finely chop the fresh cilantro. Place them into a large mixing bowl.
Squeeze the juice of the limes into the bowl. Add the apple cider vinegar, a splash of extra virgin olive oil, and salt to taste.
Mix everything together very well so the onions are evenly coated.
Let the onions rest for a few minutes so they cure and absorb all the delicious flavors before serving.
Cook it hands-free.
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