Tangy, jewel-bright, and ready to elevate just about anything on your plate, these pickled red onions are one of those condiments you'll want to keep stocked in the fridge at all times. The brine comes together in minutes with apple cider vinegar, a touch of sugar, kosher salt, and warm spices — no complicated steps, no special equipment beyond a mason jar and a small saucepan. What makes this recipe so refreshing is how clean and straightforward the ingredient list is — every single component is naturally grain-free, so there's zero guesswork about hidden fillers or fermented grain-based vinegars sneaking in. Apple cider vinegar does all the heavy lifting here, giving the onions that gorgeous deep pink color and a bright, mellow acidity that plays well with everything from tacos to grain bowls to a simple cheese board. A pinch of red pepper flakes adds just enough warmth to keep things interesting without overpowering the delicate pickling flavor. Once cooled and sealed, these beauties are ready to use in under an hour — though they only get better the longer they sit in the fridge.
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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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