These 10-minute quick pickled onions are a quintessential kitchen staple. Vibrant, sharp, and incredibly simple to prepare, they have a unique ability to brighten a bowl of grains or add a necessary hit of acidity to a simple sandwich.

If any single ingredient deserves to be labeled as a “flavor hack,” it’s the quick pickled onion. These vinegar-soaked slices contribute a necessary sharpness and crunch to almost any dish, yet they’re significantly milder than raw onions—which, as my mom used to say, have a tendency to “repeat” on one for hours after a meal.

I reference quick pickled onions constantly throughout my recipes. They’re my go-to solution for those moments when a grain bowl, sandwich, wrap, or taco feels a bit flat.

The beauty of the “quick” or “refrigerator” pickle is that it requires no canning baths or long wait times. Even fifteen minutes in a hot pickling liquid is enough to remove the raw “bite” and transform a humble red onion into a bright, fuchsia condiment.

Ingredients and Adaptations

One of the reasons this preparation has become such a permanent fixture in my meal prep is its inherent flexibility. While the ratio of vinegar to water stays constant, the flavor profile can be shifted easily depending on what’s in your pantry.

• The Onion: While I prefer red onions for their stunning color, the ingredient ratio in the recipe works beautifully for shallots, white onions, or even yellow onions if that’s what you have on hand.
• The Vinegar: I typically reach for apple cider vinegar when I make quick pickles, because I like its fruity flavor. I also like white distilled vinegar, which provides a cleaner, sharper tang. Champagne vinegar is a lovely, more delicate alternative.
• The Sweetener: I’m a big fan of the agrodolce flavor profile—balancing acid and sweetness. Pickles are very acidic, and I enjoy them more when there’s a touch of sweetness in the brine. I achieve this by adding a very small amount of sugar. Maple syrup can be substituted, or you can choose to omit the sweetener altogether if you feel strongly about it.

Notes on the Process

Refrigerator pickling is a low-effort technique, but a few small details are worth spotlighting:

• To Heat or Not to Heat: I choose to bring my pickling liquid to a simmer before pouring it over the onions. While you can use cold liquid for quick pickles, the heat helps to dissolve the salt and sugar efficiently and softens the onions just a little. This means that they can be ready to eat sooner, rather than later.
• Now or Later: Speaking of this, the pickled onions can be enjoyed as soon as fifteen minutes after you add the brine. I prefer them cold, so I recommend allowing them to marinate for at least a few hours in the fridge. The color and flavor will continue to deepen and improve after twenty-four hours and as the onions are stored.
• The Slice: I prefer my pickled onions to be quite thinly sliced. I think this makes it easier to mix them into grains, salads, and other dishes. If you like more crunch and a more pungent flavor, you can choose to slice your onions a little more thickly.

Serving Suggestions

These onions are a true multitasker. They’re a classic addition to a lentil Niçoise salad or a tofu egg salad sandwich, but they also add a necessary pop of brightness to heartier dishes like cumin-spiced lentils and rice.

On nights when I’m keeping things simple, I love adding them to a leftover bowl for added zing or using them as a finish for a vegan burger, whether homemade or frozen. The sharp acidity provides a welcome contrast to savory flavors.

4.10 from 11 votes

10-Minute Quick Pickled Onions

Author – Gena Hamshaw

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Cook Time: 10 minutes minutes

Total Time: 10 minutes minutes

Yields: 1 cup

Ingredients

• 1 red onion, medium size (you can also use white onion, yellow onion, or shallot)
• 3/4 cup water
• 1/2 cup vinegar (apple cider, white distilled, white wine, and rice vinegar will all work)
• 1 1/2 teaspoons kosher salt
• 2 teaspoons cane sugar (optional)

Instructions

• Bring the water, vinegar, salt, and sugar to a vigorous simmer in a sauce pot over medium high heat. While the pickling liquid comes to a simmer, peel, trim and slice the onion into very thin slices.
• Place the sliced onion into a wide-mouthed mason jar (at least 1 pint/480ml and up to 2 pints/950ml in volume).
• Pour the hot liquid into the mason jar and over the red onions. If all of the onions are not submerged in the pickling liquid, use a spoon to press them down into it. Their volume will decrease as they pickle. 
• Cover the mason jar and transfer it to the fridge for storage. The pickles will be ready in as few as 15 minutes, but they benefit from cooling in the fridge for at least a few hours. I prefer them after 24-48 hours.

Notes

Quick pickled onions can keep in their airtight container in the fridge for up to two weeks.

I hope this simple preparation becomes as much of a permanent fixture in your kitchen as it has in mine. It’s a small detail, but it is often the one that makes a meal feel complete.

xo