Pickled Onions Recipe

This Pickled Onions Recipe is one of my favorite ways to add a quick burst of flavor to any meal. The onions turn crisp, tangy, and slightly sweet with just four simple ingredients. I always keep a jar in the fridge for easy meal upgrades.

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Why This Recipe Works

I love making these Pickled Onions because they’re simple, colorful, and instantly make any meal taste brighter. Here’s why this recipe stands out:

Simple Ingredients: Just four pantry staples come together to create something full of flavor. It’s the same easy, no-fuss method I use for my Quick Pickled Radishes.
Balanced Flavor: The rice vinegar gives a gentle tang without being too sharp, while the salt brings out the onion’s natural sweetness. It’s a clean, crisp flavor that works with almost anything.
Beautiful Color: Red onions turn the prettiest pink once pickled, adding a pop of color to your dishes. It reminds me of the vibrant tones in my Homemade Pickled Cabbage With Beets.
Quick and Easy: These onions come together in minutes and are ready in just a few hours. The flavor gets even better overnight, making them perfect for meal prep.
Versatile and Fresh: Add them to tacos, salads, sandwiches, or grain bowls. They bring crunch, color, and a bright tang that instantly lifts any meal.

If you enjoyed this recipe, please come back and give it a rating. I ❤️ hearing from you!

Chopping onions for Lena's Kitchen Pickled Onions

Ingredients

Red Onion – The base of this recipe, red onions add a mild sweetness and turn a beautiful pink once pickled. Slice them very thin for the best texture. You can also use shallots, white, or sweet onions if that’s what you have on hand.
Rice Vinegar – Gives the onions a gentle tang without being too sharp. I like using unsweetened rice vinegar for its smooth flavor.
Hot Water – Helps dissolve the salt and slightly softens the onions so they absorb the pickling liquid evenly.
Sea Salt – Balances the acidity and enhances the natural sweetness of the onions. Fine sea salt works best, but kosher salt can be used too – just adjust slightly to taste.

For full list of ingredients and instructions, see recipe card below.

Instructions

Prep the Onion: Cut the red onion in half, peel, and slice very thin into half-moon slices. A mandolin works great for getting even, paper-thin cuts.
Soak and Rinse: Add the sliced onions to a bowl with warm water. Gently squeeze the onions with your hands to mellow their sharp flavor, then drain the water completely.
Make the Brine: In a measuring cup, combine hot water, rice vinegar, and sea salt. Stir until the salt is fully dissolved.
Assemble the Jar: Place the onions into a clean jar (a 35.9 oz Weck jar or a wide-mouth 32 oz mason jar works well). Pour the brine over the onions, making sure they’re fully submerged.
Cool and Chill: Let the jar cool on the counter, then cover with a lid and refrigerate for at least 2–4 hours. For the best flavor and color, leave them overnight.

For full list of ingredients and instructions, see recipe card below.

Jar full of Lena's Kitchen Pickled Onions

Substitutions & Variations

Here are some of my favorite substitutions and variations:

Onion Options: I usually make these with red onions for their mild flavor and pretty pink color, but white or sweet onions work great too. You can also try shallots for a stronger, more pungent taste.
Vinegar Choices: I love using rice vinegar for its smooth, mellow flavor, but you can use other vinegars as well. But it’s important to use one without any sugar, and for this reason I don’t recommend apple cider or white vinegar. I’ve tried them with both and found the flavor to be overpowering, which will not give you the intended flavor meant for this recipe.
Add-Ins: Try adding a few peppercorns, a garlic clove, or a pinch of chili flakes for extra depth. A few slices of raw beet will give the onions a deeper pink hue without changing the flavor.

What to Serve with Homemade Pickled Onions

Main Dishes

These Pickled Onions add a bright, tangy crunch to hearty meals. We love scattering them over Pork Carnitas Skillet Nachos for a fresh contrast to the rich pork.
They’re also delicious tucked into Smoked Salmon Street Tacos or spooned over Low Carb Asian Pork Lettuce Cups for a crisp bite. For something simple and satisfying, try them on Healthy Taco Bowls.

Salads and Others

We often toss these onions into fresh salads for extra flavor and color. They pair beautifully with Game Day Taco Salad or a classic Wedge Salad.
For lighter bites, add them to Pepperoncini Chicken Salad Lettuce Wraps or serve alongside Fully Loaded Keto Deviled Eggs for a tangy finish.

FAQs

Do I need to heat the vinegar mixture?

No need to boil it. Just use hot water to help dissolve the salt, then mix in the vinegar before pouring it over the onions. This keeps the onions crisp while still absorbing the flavor.

Can I reuse the pickling liquid?

Yes, you can reuse it up to four times. Just adjust the salt and vinegar each time to keep the balance right.

How long do pickled onions need to sit before eating?

They’ll be ready in about 2 to 4 hours, but the flavor deepens if you leave them overnight. I usually make them the day before so they’re perfectly tangy and crisp.

How long do they keep?

Store your pickled onions in a sealed jar in the refrigerator for up to two weeks. They taste best within the first week, but you can enjoy them longer if they still smell and look fresh.

More Recipes You’ll Enjoy

Refrigerator Dill Pickles Recipe – This Refrigerator Dill Pickles Recipe (Keto and Whole30) is made by throwing everything in a jar. In 1 day, you have crisp homemade pickles!
Creamy and Easy Potato Salad with Pickles – Serve this Creamy and Easy Potato Salad with Pickles at barbecues, potlucks, and picnics. Chopped cornichons give it a real pop of flavor!
Caramelized Onion Dip – A bag of chips isn’t complete without Caramelized Onion Dip. It’s sensationally creamy, tangy, and speckled with golden caramelized onions.
Fresh Pico De Gallo – This Fresh Pico de Gallo is the salsa I make on repeat. It’s light, punchy, and loaded with juicy tomatoes, lime, and just enough heat.

If you try this Pickled Onion recipe, let me know what you think! Rate and review this recipe in the comments below. Don’t forget to take a picture and tag me on Instagram @lenaskitchenblog!