Tangy, jewel-bright, and ready to elevate almost anything you put them on, these pickled red onions are one of those condiments that quietly become a kitchen staple. The brine comes together in just a few minutes on the stovetop — apple cider vinegar, water, sugar, and salt — and the result is a punchy, slightly sweet pickle that turns a gorgeous fuchsia as it cools. For anyone managing a nickel sensitivity, this recipe is a genuine win because it skips the high-nickel ingredients that sneak into so many condiments and processed foods. Red onion, apple cider vinegar, and a handful of pantry spices are all you need, keeping things clean and straightforward. A pinch of red pepper flakes adds a subtle kick if you want a little heat, but the recipe works beautifully either way. Pile them onto tacos, grain bowls, sandwiches, or grilled proteins — anywhere you want brightness and a little bite. Once you have a jar of these in the fridge, you'll find yourself reaching for them constantly.
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Pack the sliced red onion into a clean 16 oz mason jar, pressing gently so the slices fit snugly without crushing them.
Combine the apple cider vinegar, water, sugar, and kosher salt in a small saucepan over medium heat, stirring until the sugar and salt are fully dissolved, about 2–3 minutes. Remove from heat.
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