Pickled Red Onions

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The best quick and easy Pickled Red Onions that are seriously so good. Serve them with tacos, burgers, salads, rice bowls - they make everything taste better!

17 CAL 5g CARBS 0g FAT 0g PROTEIN 0
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I'm all about adding some red onion to dishes to jazz them up, but these Pickled Red Onions are on another level! It makes virtually any meal taste restaurant worthy.

They are so good with all kinds of Mexican dishes, including chicken tinga tacos, steak tacos, and taco bowls. But they are also amazing on burgers, salads, grilled chicken, and so much more. Let's be honest: these pickled onions taste amazing in almost everything.

The great thing about pickled onions, as opposed to many pickles, is that they are quick. No long brining time. No complicated canning. These are ready to go in just 30 minutes, and all you need is red onion, some limes, white vinegar, salt, and peppercorns.

Key Ingredients and Substitutions

To make these tangy pickled onions, you will need a few key ingredients that you probably already have on hand:

  • Red onion: With its slightly sweet flavor and bright color, red onions are the perfect choice for pickling. Sweet onions, yellow onions, white onions, and baby onions also work.
  • Lime juice: Freshly squeezed lime juice is the key to locking in all that zesty flavor. I highly recommend sticking to fresh limes for the freshest flavor. Lime juice is key in making Mexican pickled onions. If you prefer a more traditional pickled onion, swap it for white or apple cider vinegar. If you use all vinegar, you will need to add some water. Instructions below.
  • White vinegar: Feel free to swap this out for apple cider vinegar if you prefer.
  • Salt: Pickles need salt to bring out the flavor. Kosher or sea salt is best.
  • Peppercorns. Black peppercorns are optional, but I love the peppery flavor they add to this dish.
  • Optional sweetener: Red onions have a lot of innate sweetness, so I don't like adding sugar or sweetener to my pickled onions. If you prefer a sweeter pickled onion, add 1-2 tablespoons of honey, maple syrup, or white sugar.

Pickled onions with thinly sliced red onions in a jar with lime juice, vinegar, salt, and peppercorns with cilantro on the side.

Can white or yellow onions be pickled?

Absolutely! Although this recipe calls for red onions, you could pickle any kind of onion using the same method. Feel free to try a few different variations to see which one you like best.

We have made this recipe with every type of onion and they are all delicious!

How to Make Quick Pickled Red Onions

These pickled onions couldn't be easier to make. Here's what to do.

1. Choose Mexican Pickled Onions or Traditional Pickled Red Onions

There are two main types of pickled onion recipes. One is Mexican, and the pickling liquid is mostly lime juice. The other is more traditional, using vinegar as the main liquid.

Both methods create delicious pickled onions. We prefer Mexican-style pickled onions for Mexican dishes since the lime in the onions complements Mexican flavors.

With that said, both methods are delicious and work with any food you choose. One important note: the traditional pickled onions store a bit better in the fridge since the lime juice breaks the onions down more over time.

2. Thinly Slice the Onions

For both methods, start by slicing the onions thinly. Thick onions will not be pickled in 30 minutes. If you have a mandoline, that is the easiest method for getting thin, consistent onion slices. Otherwise, just slice them thinly with a sharp knife.

Pro tip: If you prefer really mild onions, soak them in ice-cold water for 30 minutes before pickling them. This removes some of that strong, pungent onion flavor.

3. Prepare the pickling liquid

For Mexican-style pickled onions, you need enough lime juice to cover the red onions sliced completely. Using a citrus juicer speeds up this process. For every red onion, you will likely need 4-5 limes. Combine the lime juice with white vinegar, kosher salt, and peppercorns.

For a more traditional pickling liquid, simmer ¾ cups of vinegar, ¼ cups of water, 1 tsp kosher salt, and 1-2 tablespoons of sweetener on the stovetop.

4. Combine onions and pickling liquid

Combine the thinly sliced onions and pickling liquid. Give everything a good stir or shake, and press the onions down into the liquid to ensure they are fully submerged.

Let the red onions rest for 30-60 minutes. Taste and season with salt if needed.

5. Serve

Now it's time to eat! Serve the pickled red onions with your favorite dishes. The leftovers can be stored in the fridge for up to two weeks.

Jar with pickled red onions and lime juice with wooden tongs.

Can I make this recipe in the microwave?

Yes! To make Pickled Red Onions in the microwave, follow these simple steps:

  1. Slice the onions: Use a sharp knife or mandolin to thinly slice the red onion. Place the slices in a microwave-safe bowl.
  2. Prepare the pickling liquid: In a separate microwave-safe container, combine lime juice, white vinegar, salt, and peppercorns. You can also add a bit more lime juice if the onions won't be fully covered. Microwave the pickling liquid for about 30-45 seconds to warm it up and dissolve the salt.
  3. Combine: Pour the warm pickling liquid over the onions in the bowl. Stir or press the onions down to make sure they're mostly submerged.
  4. Let sit: Allow the onions to sit for at least 30 minutes in the microwave-safe bowl, ideally 60 minutes, to absorb the flavors and pickle.

This quick microwave method will still give you those deliciously tangy pickled onions perfect for topping tacos and sandwiches or adding to your favorite dishes!

Pickled Onions Variations: Spicy, Garlicky, and More

Yes! You can prepare this recipe as is or switch it up a bit to suit your preferences. Here are some of my favorite ways to make these pickled onions your own:

  • Make it spicy: Try adding some jalapeños, serrano, or habanero peppers to the jar with your onions. Habanero peppers are the most traditional in Mexico, but they will be really spicy.
  • Add garlic: For some extra garlic-y flavor, try adding some thinly sliced garlic cloves to the jar.
  • Add some herbs: For a ton of added flavor, feel free to toss some herbs into the mix. Some of my top choices include fresh dill and bay leaves.
  • Switch up your vinegar: No white vinegar on hand? No problem! You can use rice vinegar or apple cider vinegar for this dish as well.
  • Blanch the onions: If you want to mellow out the onion flavor, blanch them in hot water before adding them to your brine.

Ways to Serve Pickled Onions

Pickled Red Onions are an incredibly fun dish to serve, as they go great with almost everything! To get you started, here are a few ideas for serving your pickled onions:

Frequently Asked Questions

Here are some of the most frequently asked questions about this pickled onion recipe:

Because they're so versatile, Pickled Red Onions are great to have on hand for salads, bowls, tacos, and other dishes throughout the week! Therefore, I typically double the batch, so I have extras to keep around.


To store pickled onions, simply keep them in the jar you marinated them in. Then, you can store them in the fridge for up to 2-3 weeks. I don't recommend freezing this dish.

 

Pickled onions have a tangy, sweet flavor, and they are known for their signature crunch. The lime juice gives them an incredibly refreshing flavor, while the peppercorns balance it out with a peppery twist.

Because they have such a long shelf life, it can be tricky to tell when pickled onions have gone bad. However, if they develop a funky smell, change in color, start bubbling in the jar, or get slimy in texture, then it's time to toss them out.

 

Red onions that are pickled in lime juice and vinegar served in two glass jars.
The Recipe
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Pickled Red Onions

17 CAL 5g CARBS 0g FAT 0g PROTEIN 0
PREP TIME: 5 Min
COOK TIME: 30 Min
TOTAL TIME: 35 Min
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Ingredients

US METRICS
  • 1 red onion, sliced thin
  • 4 limes, juiced (more if needed)
  • 1 tbsp white vinegar
  • 1 tsp kosher salt (or sea salt)
  • 1 tsp black peppercorns

Instructions

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1

Slice the onions very thin using a sharp knife or mandolin. Add the onions to a glass jar or bowl.

2

Cover with lime juice, white vinegar, salt, and peppercorns. Add more lime juice if the onions aren't mostly submerged.

3

Shake or stir, pressing the onions down into the lime juice. Let sit for at least 30 minutes, ideally 60 minutes.

Equipment

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Nutritional Facts
Serving Size: 1/4 cup
Amount Per Serving
Calories 17
Calories from Fat 1
% Daily Value *
Total Fat 0g
0%
Saturated Fat 0g
0%
Monounsaturated Fat 0g
0%
Polyunsaturated Fat 0g
0%
Cholesterol 0mg
0%
Sodium 296mg
13%
Total Carbohydrate 5g
2%
Dietary Fiber 1g
5%
Sugars 1g
Protein 0g

* Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.

The Nutritional Values provided are estimates only and may vary based on the preparation method.

Notes

This recipe includes methods for Mexican-style pickled onions in lime juice and more traditional vinegar pickled red onions.

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About the author Meet Kristen McCaffrey
Hi, I’m the cookbook author, recipe developer, and food enthusiast behind Slender Kitchen. I am obsessed with making healthy food that is easy to prepare and absolutely delicious. Meal planning is my secret weapon and I hope I can make meal time easier for you with our tried and tested recipes and foolproof meal plans. Learn More
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