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Cut the onion in half from tip to root. Remove the papery skin.
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Finely slice both onions halves and place in a small bowl. Cover with the apple cider vinegar (use more if necessary).
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Gently massage (oh, yes, again) the onions in the vinegar.
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Allow to sit for at least five minutes.
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Squeeze excess liquid from the onions before plating.
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As another option, place the sliced fresh onions in a small glass jar, cover with apple cider vinegar and place the beet root in as well.
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Cover and allow to sit in the fridge for up to two months; your quick pickled onions will become pink, and you can continue to top off the vinegar as needed and add fresh onion slices as you see fit.