Quick pickled red onions are the perfect addition to sandwiches, street tacos, and salads. You can also incorporate pickled red onions in mayo-based sauces for an extra kick of flavor. 

Pickling the onions transforms them into a sweet and tangy topping that is perfect for so many dishes. If you are looking for a new way to add some flavor to your meals, these pickled onions will become a new kitchen staple. 

Why This Recipe Works

• The pickling process mellows out the sharpness of the onions, making them more palatable.
  
• This recipe is incredibly versatile and can be adjusted to your liking. Experiment with different types of vinegar and spices. 
  
• The optional step of blanching the onions will mellow out the onion if you have one that is harsh and sharp (larger onions tend to have a stronger flavor). 

Making a batch of quick pickled red onions requires very little time and effort. All you need are a few simple ingredients and some glass jars. It is so convenient to have these on hand in the fridge, and these babies add a nice pop of color to any dish.

The Ingredients 

Here is a list of the ingredients you will need to make quick pickled red onions. Scroll down to the printable recipe card for all the details. 

• Thinly sliced red onions
• Boiling water (if you want to blanch the onions first)
• Vinegar
• Sugar
• Salt
• Fresh thyme
• Whole peppercorns
• Other seasonings to your liking

We recently received a Santoku knife from Hast, and we love the minimalist design and the lightweight, ergonomic feel. The sharp blade makes it easy to make super thin onion slices. A good sharp knife makes all the difference.

How to Make Pickled Red Onions

Here is a brief overview of how to make red onion pickles. Scroll down to the printable recipe card for all the details.

1. Thinly slice a couple of red onions.
2. Blanch the onions in boiling water for one minute, then drain them. This step tones down the intensity of the raw onion.
3. Heat the rest of the ingredients in a small pot over medium heat until the salt and sugar dissolve.
4. Stuff the onion slices into each jar, then pour the vinegar mixture on top until they are fully submerged.
5. Put a lid on each jar and store the pickled red onions in the fridge. 

Now go make a juicy hamburger or some hot dogs and stuff it with pickled red onions 😉 They are also great additions to a potato salad. 

Tips for success

• Use a mandoline or a slicing attachment on a food processor to make even, thin slices. If you have knife skills, a quality chef’s knife will work.
  
• If you can only find large red onions, you will want to blanch them because larger onions tend to be more pungent.
  
• Optional add-ins to consider when making quick pickled onions. Include fresh garlic, crushed red pepper flakes, fennel seeds, whole cloves, allspice berries, bay leaf, mustard seeds, or celery seeds.
  
• Use the leftover pickling vinegar in a homemade salad dressing if you’d like.
  
• Store them in the fridge and continue to use them on your favorite sandwiches, tacos, and salads for up to three weeks. 

Frequently asked questions 

Whether you add these to sandwiches, salads, tacos, deviled eggs, soups, or sauces, there is always a way to utilize quick pickled red onions. We hope you enjoy this colorful condiment as much as we do!

Helpful Tools

Some of the following are affiliate links. We may receive a small commission if you click on these links and purchase something. You don’t pay any extra, but it will help us keep the lights on. 

• Glass jars
• Saucepan
• Sharp knife
• Mandoline

Some More Recipes You Will Love:

Add pickled onions to our pinwheel sandwiches or pulled pork appetizers. They are also a big hit on charcuterie boards alongside cheese spreads and meat.

Add some tang to your avocado toast or spinach salad with a few pickled sliced onions. They even taste great in a grain bowl. 

Are you ready to try more pickled vegetables? Some of these recipes may also interest you: pickled cucamelons, pickled watermelon radish, or hot dilly green bean pickles.

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Did you make this recipe? We would love to hear from you. Drop us a comment below. 

This recipe was originally published on April 24, 2015. We updated the photos and added some helpful tips.