Tangy, jewel-bright, and endlessly versatile, these pickled red onions are the kind of condiment that quietly transforms every meal they touch. The brine is a simple mix of apple cider vinegar, water, sugar, and salt — no exotic pantry additions, no hidden coconut derivatives, just clean, straightforward ingredients you can trust. That matters more than it sounds, since coconut sugar and coconut vinegar have a way of sneaking into trendy pickling recipes these days. Here, everything is refreshingly transparent. A pinch of black peppercorns adds gentle warmth, and a dash of red pepper flakes gives you the option to dial up the heat. Within an hour of making them, the onions turn a stunning magenta pink and mellow into something tender, bright, and just a little spicy. Pile them onto tacos, grain bowls, sandwiches, or grilled meats — honestly, the harder question is what you *won't* want to put them on.
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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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