The condiment is tangy with a more subtle onion flavor than using raw onions. The onions become soft sitting in the pickling mixture and turn a beautiful bright pink shade that lasts for up to two weeks in the refrigerator.
In a small saucepan, bring the vinegar, 1 cup of water, sugar, salt and peppercorns to a boil over medium heat, stirring until the sugar and salt dissolve.
Remove from heat, separate the onions and add to a large mason jar then pour the vinegar mixture over the top.
Close the jar and let sit for at least 30 minutes to 1 hour before using. Refrigerate for up to 2 weeks and drain before using.
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Notes
While red onions are the most popular option for their vibrant pink result and mild sweetness, you can also use white onions, yellow onions, or even shallots.