4-Ingredient Pickled Onions

overhead view of a mason jar full of pink pickled red onions on a wooden table

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  1. Place the sliced onions in a large wide-mouth mason jar.
  2. Pour the vinegar over the onions, adding more as needed to cover the top. Add the salt and peppercorns, seal, and shake the jar vigorously to combine.
  3. Refrigerate for at least one day before serving!
  4. Enjoy.