Zesty, tangy, easy and delicious Red Pickled Onions! A simple, and very quick pickle that can elevate any dish!
Pickled Red Onions on a old plate with a fork and spoon.

I know you are going to love my best red pickled onions recipe. This 2-ingredient recipe (plus seasoning) is incredibly tasty! The best bit is how surprisingly different the pickled red onions taste and they only take minutes to make!

Quick Pickled Red Onions

I have been making this recipe for years, decades even. These are a little different to the traditional British-style pickled onions recipe. They are quick and easy with no boiling or cooking required.

Quick pickled red onions in lime juice are the perfect accompanying side dish for Mexican cuisine. But, not only that they team perfectly with all salads, burgers, eggs and more. I use them for all meals including breakfast dishes.

Why You Will LOVE this Recipe

  1. It’s so tasty. These quick Mexican pickled red onions are far from the old pickled onions I ate as a kid. This is a no sugar low carb recipe.
  2. Quick and Easy. Just two main ingredients and all you need to do is slice, mix and chill them.
  3. NO cooking needed. This is a no-cook pickle recipe. Yay!

The Ingredients

Scroll to the recipe card at the bottom for the quantity of ingredients used and the full detailed recipe for these quick pickled onions! Keep reading for more details on the ingredients, substitutes and step by step instructions on how to make them.

Onion, salt and lime juice in bowls.

You really only need to ingredients in this super low carb and keto friendly onion recipe. This is a sugar free pickle recipe. Sugar or sweetener is just not needed for either the pickling process or flavour in this recipe.

Red onions – aka Spanish onions are perfect for this recipe. I use fresh red onions for pickling not frozen. You can use white onion if you prefer.

Lime juice – I prefer lime juice over apple cider vinegar for pickled onions. You can however use apple cider vinegar if you prefer. It does make the red onions more bitter and vinegary but if that is what you would prefer go for it. ACV will also lower the carbs a little.

Seasoning – salt flakes, black pepper or red pepper flakes are perfect for this quick pickle recipe.

How to Make Quick Pickled Onions

This recipe really is simple. My pickled onions are having no cooking required. We all love that, right?

Red onion, lime juice and salt in a jar.

Step 1. Peel and slice the red onions. Place them into a glass bowl or directly into a mason jar to store them in.

Mince on toast with pickled onions.

Step 2. Cover with lime juice and seasoning. Mix to combine or pop the lid on the jar and shake to combine. Chill for 20-30 minutes before using the sweet pickled onions on your favourite tacos, burgers, salad or comfort food. Served here with our delicious Savoury Mince recipe.

Pickled Red Onion Variations

There are loads of easy ways to make simple onion pickles. For me, this is the best pickled red onions because it is quick. A true “quickle” recipe.

If you only have white or brown onion you can still make it. I would recommend adding a little sweetener as those onions are not so sweet in flavour.

Korean Pickled Onions – add a little soy or coconut aminos and chillies (to taste)

Asian Pickled Red Onions – swap the lime juice for rice wine vinegar. Add 1/2 teaspoon of finely minced ginger too. (These are super delicious).

Ranch Pickled Onions – Oh yeah baby! Add two teaspoons of our Ranch Seasoning and that is all you need! Maybe even add some sliced dill pickle for some extra yumminess!

Frequently Asked Questions

Are onions keto friendly?

Yes and no. One cup of onion has approximately 13g net carbs. So moderation is key.

Can I freeze pickled onions?

You can but I would recommend freezing the onions before pickling. While I use fresh red onions in this easy pickled onion recipe you can use frozen but fresh is so much better if you have them.

Can I swap the lime juice for anything else?

Sure thing! Use pickle juice or brine from any of your favourite pickles. Alternatively, use some apple cider vinegar or lemon juice in its place.

More Recipes to Try

If you don’t already know what to serve lime pickled onions with then here are just a few of my favourites.

  1. Keto Taco Recipe
  2. The Best Keto Taco Salad
  3. Birria Tacos with Consommé
  4. Keto Tortillas
  5. Keto Wraps

We do have a lot of delicious keto recipes in our cookbooks using red pickled onions. Check out our cookbooks Slow Cook Keto and Keto Loco for some incredibly tasty keto Mexican recipes.

Soft haloumi wraps with pork mince and pickled onions.

RAVING NEW FAN? Subscribe to our newsletter. Join our keto community on FacebookInstagram or see all the new stuff and easy keto recipes on Pinterest.

Keto Meal Plans & Support
Pickled Red Onions on a old plate with a fork and spoon.

Mexican Red Pickled Onions

Zesty, tangy, easy and delicious Red Pickled Onions! A simple, and very quick pickle that can elevate any dish!
5 from 82 votes!
Prep Time: 1 minute
Cook Time: 20 minutes
Total Time: 21 minutes
Course: Side Dish
Cuisine: Mexican
Diet: Diabetic, Gluten Free, Vegan
Recipe Category: Low Carb
Calories: 9kcal
Author: Megan Ellam
Servings: 8 serves
Tap or hover over number to scale ingredients
Print Pin Save Rate



  • 1 (1) red onion thinly sliced
  • 0.5 cup (0.5 cup) lime juice approx. 5-6 limes
  • 1 teaspoon (1 teaspoon) salt flakes



  • Place all ingredients into a large jar and shake to combine.


  • Place all ingredients into the mixer; mix 30 sec/ reverse/speed 1. Transfer to a jar and cover with lid. Chill for at least 20-30 minutes before serving.


This recipe yields approximately 8-10 servings. The actual number of servings will depend on your preferred portion sizes. 
To calculate the weight of one serving, prepare the recipe as instructed. Weigh the finished recipe, then divide the weight of the finished recipe by 8-10. The result will be the weight of one serving. 
Nutritional values shown are guidelines only. They are for 1 serving using the ingredients listed. 
Store in an airtight glass jar in the fridge for up to 10 days. Metal can be reactive to the acid in the lime. Add more onion to the pickle juice if needed as you use them. 
Instead of lime you can substitute lemon juice or a pickle juice brine from any dill pickles or pickled chillies for added flavour.
The recipe card instructions contain the most basic of steps and list of ingredients. If you have any queries, questions or are unsure of substitutions, please scroll up to the blog post for more information.
Mexican pickled onions a little goes a long way. Remember that onion carbs can really stack up so use sparingly as a garnish and flavour boost to your meal.

Your Own Notes


Serving: 1serve | Calories: 9kcal | Carbohydrates: 3g | Protein: 1g | Fat: 1g | Saturated Fat: 1g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 1g | Sodium: 292mg | Potassium: 38mg | Fiber: 1g | Sugar: 1g | Vitamin A: 8IU | Vitamin C: 6mg | Calcium: 5mg | Iron: 1mg | Magnesium: 3mg | Net Carbs: 2g
Tried this recipe?Mention @meganellam or tag #madcreations!

Megan Ellam is an Australian keto recipes blogger and author of amazing keto cookbooks such as Keto Mojo, Slow Cook KetoKeto LocoThe Healthy Family Keto Cookbook and Every Day Keto.

Megan has been following a ketogenic diet since being diagnosed with insulin resistance in early 2017.

Share This Recipe

20 responses to “Easy Mexican Red Pickled Onion”

  1. Nina

    5 stars
    Super easy and super delicious 😋 😍 👌 It was perfect with chicken tortilla tonight. Another amazing recipe, thank you!

    1. Megan Mad Creations Hub


  2. Rob

    5 stars
    What an easy and delicious pickled onion recipe! Love all the variations suggested!

    1. Megan Mad Creations Hub

      You are welcome Rob

  3. nancy

    5 stars
    perfect condiment and it’s so stinking easy to make!

    1. Megan Mad Creations Hub

      They sure are!

  4. Jean

    5 stars
    great addition on the side for my rice meals, so easy and appetizing.

    1. Megan Mad Creations Hub


  5. Andrea

    5 stars
    love how quick these are to make! such a delicious topper!

    1. Megan Mad Creations Hub

      So perfect!

  6. Freya

    5 stars
    These are so delicious and perfect with anything! I love speedy pickles!

    1. Megan Mad Creations Hub

      I am so happy you enjoyed them.

  7. Lucy Dillon

    5 stars
    I love this recipe. I try to have a jar in the fridge all the time. They are very easy to make and are full of flavour. Add them to wraps and I love adding them to salads.

    1. Megan Mad Creations Hub

      They are so tasty aren’t they.

  8. Helen Jack

    5 stars
    These are perfect when you need that “zing” to help cut through rich food or just simply eat them straight from the jar..simply delicious! So quick and simple to make.

    1. Megan Mad Creations Hub

      Glad you enjoy them Helen

  9. Lynda

    5 stars
    This is such a quick tasty red onion pickle. I have a jar in the fridge and just keep adding to it when it gets a little on the low side. It’s great on salads and wraps and looks pretty too. I love the zestyness of the lime juice. Such a simple recipe that’s big on flavour.

    1. Megan Mad Creations Hub

      They are so good aren’t they Lynda

  10. Penny P

    5 stars
    I LOVE these pickled onions. They’re so simple to make and lift any dish I add them to, from a simple salad to tacos. I’ve even topped bacon and eggs on toast with them! So delicious.

    1. Megan Mad Creations Hub

      So happy you love them Penny

5 from 82 votes (72 ratings without comment)

Leave a Reply

Your email address will not be published. Required fields are marked *

Recipe Rating