1red onion, sliced into 1/4"-inch thick half moons (save the skins!)
1cupapple cider vinegar or red wine vinegar
1cupwater
1tbspkosher salt
Instructions
Stuff the onion into a large mason jar, making sure the onions aren’t stuck together. Add the vinegar, water, and salt. Cover with a tight lid and shake to combine.
Remove the lid and place the onion skins on top and press the onions down using a spoon or your hands so that the onions are submerged in the liquid (the skins will help give it that bright pink color, but totally optional). Place in the fridge overnight.
You can eat these within 2 hours, but after 24-48 hours, they will taste more pickled and you’ll have bright pink onions!