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Pickled Red Onions are the bright pink, tangy-sweet topping that makes everything taste better, and they take all of five minutes of hands-on work. I keep a jar in the fridge at all times and pile them on *taco night* until Maddie asks why the onions are pink. They are unreal on our birria beef tacos.
A quick warm vinegar brine softens that harsh raw-onion bite and turns ordinary red onion into a crisp, zippy condiment you will want to put on everything.
Pickled Red Onions Quick Look
- 🕒 Prep Time: 10 minutes
- 🌡️ Cook Time: 5 minutes
- ⏳ Total Time: 15 minutes plus chilling
- 🍽️ Serving: 8 servings
- ⚡ Calories: 40kcal
- 🌶️ Flavor Profile: Tangy, lightly sweet, and crisp with mellow onion bite
- ✋ Difficulty: Very easy, even simpler than our Mexican street corn
Quick Answer
To make Pickled Red Onions, warm 1/2 cup water, 1 cup white vinegar, and 1/3 cup sugar in a saucepan until the sugar dissolves. Thinly slice a red onion and smash a couple of garlic cloves, then add them to the warm brine and press to submerge. Let it cool to room temperature, then transfer to a jar and refrigerate. They are ready in about an hour but even better after sitting overnight, and they keep for up to two weeks.
Jump to:
Why This Recipe Works
Click to see the technique science
- The warm brine works fast. Heating the vinegar, water, and sugar dissolves the sugar and quick-pickles the onions in minutes instead of days.
- It tames the raw bite. Pickling mellows the harsh, sharp flavor of raw red onion into something bright and craveable.
- Just five ingredients. Red onion, garlic, water, vinegar, and sugar are all it takes, and you probably have them already.
- They keep for weeks. A jar lasts up to two weeks in the fridge, so a few minutes of work pays off all week long.
- They go on everything. Tacos, salads, sandwiches, burgers, grain bowls, avocado toast, the gorgeous pink crunch upgrades it all.
- No canning required. This is a simple refrigerator pickle, so there is no water bath, no sterilizing jars, and no special equipment. Just slice, pour, and chill.
Why You’ll Love This Recipe
- They take five minutes of hands-on work and instantly upgrade almost any dish.
- The warm brine mellows the raw onion into a perfect tangy-sweet crunch.
- They are the best topping for our smothered beef burritos and taco night.
Key Ingredients
Five simple ingredients are all that stand between you and a jar of tangy pink onions.
- Red onion: thinly sliced, it turns a gorgeous bright pink as it pickles.
- White vinegar: the tangy backbone of the quick brine.
- Sugar: just enough to balance the vinegar with a touch of sweetness.
- Garlic: a couple of smashed cloves add savory depth to the brine.
- Water: mellows the brine so it is bright, not harsh.
See recipe card for exact quantities.
Variations and Substitutions
These Pickled Red Onions are easy to customize.
- Use apple cider vinegar or rice vinegar in place of white vinegar for a different tang.
- Add a teaspoon of whole peppercorns, coriander seeds, or a bay leaf to the brine for extra flavor.
- Toss in a few slices of jalapeno for a spicy version.
- Swap the sugar for honey or maple syrup for a natural sweetener.
- Pile them on grain bowls, burgers, or our Mexican street corn for a tangy finish.
How to Make Pickled Red Onions
- In a small saucepan, combine the water, white vinegar, and sugar. Heat over medium heat, whisking, until the sugar fully dissolves, then remove from the heat.
- Cut off both ends of the red onion, halve it through the core, and slice into thin 1/8 inch strips. Peel and smash the garlic cloves.
- Add the sliced onion and smashed garlic to the warm vinegar mixture, pressing to submerge. Let it sit at room temperature until fully cooled.
- Transfer to an airtight jar and refrigerate. They are ready in about an hour but best after sitting overnight. Use within 1 to 2 weeks.
Recipe Tips & Tricks
- Slice the onion thin. Thin strips pickle faster and have the best crisp-tender texture.
- Use the brine warm, not boiling. Warm brine quick-pickles without fully cooking the onion to mush.
- Press the onions down so they are fully submerged in the brine for even pickling.
- Let them sit overnight if you can. They are good in an hour but the flavor deepens beautifully overnight.
- Do not toss the bluish garlic. Garlic can turn a harmless blue-green in acid. It is totally safe to eat or remove.
- Save the leftover brine to quick-pickle a second batch or to add tang to dressings.
Serving Ideas and Suggestions
These Pickled Red Onions are a finishing touch for almost anything savory. Pile them on tacos, burgers, pulled pork, hot dogs, or avocado toast.
They are incredible on our birria tacos and smothered burritos, cutting through rich, cheesy fillings with bright acidity.
Scatter them over grain bowls and big salads, or set a jar on the table next to our white chicken chili so everyone can add their own tangy crunch.
They are also one of the easiest ways to make a simple meal feel special. A plain turkey sandwich, a bowl of leftover rice and beans, or a basic burger all get an instant upgrade from that bright pink tang. Keep a jar in the fridge and you will find yourself reaching for them on just about everything, all week long.
Pickled Red Onions FAQs
Stored in an airtight jar in the fridge, they keep for up to two weeks. The flavor and color are best in the first week.
They are tasty after about an hour once they have cooled, but the flavor and color deepen the longer they sit. For the best results, make them at least a few hours or a full day ahead so the onions soften and turn that vibrant pink.
Garlic naturally reacts with the acid in the vinegar and can turn a blue or green color. It is completely harmless and safe to eat, but you can remove the garlic if it bothers you.
No, this is a quick refrigerator pickle. You only warm the brine to dissolve the sugar; the onions themselves stay crisp and are not cooked.
White vinegar gives a clean, bright tang and is what this recipe uses. Apple cider vinegar adds a fruitier, mellower note, and rice vinegar makes them softer and less sharp. You can even use a mix. Use whatever you have on hand, since they all make delicious pickled red onions.
Everything savory! Tacos, burgers, sandwiches, salads, grain bowls, avocado toast, nachos, and pulled pork are all fantastic with a pile of pickled red onions. They are especially good on anything rich or cheesy, where the acidity cuts right through. You can even reuse the leftover brine to quick-pickle a second batch or to add tang to salad dressings.
Pile a jar of these on our birria beef tacos next.
Easy Pickled Red Onions
Ingredients
- 1 medium red onion thinly sliced into strips
- 2 cloves garlic peeled and smashed
- 1/2 cup water
- 1 cup white vinegar
- 1/3 cup granulated sugar
Instructions
- In a small saucepan, combine the water, white vinegar, and sugar. Heat over medium heat, whisking, until the sugar fully dissolves. Remove from the heat.
- Cut off both ends of the red onion and discard, halve it through the core, and slice into 1/8 inch strips. Peel and smash the garlic cloves with the back of a knife.
- Add the sliced onion and smashed garlic to the warm vinegar mixture, pressing to submerge. Let it sit at room temperature until fully cooled.
- Transfer to an airtight jar and refrigerate. They are good after about an hour but best after sitting overnight. Use within 1 to 2 weeks.
Notes
Nutrition
Love This Recipe?
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What a great idea – I have never thought of pickling my own onions! Thanks for linking up with us at Tasty Tuesdays this week! Ruth x
These look like heavenly additions to salad, burgers, tacos, or just about anything! Love it. Krista @ A Handful of Everything
Hey there!! The gang over at My Personal Accent, think your recipe for Pickled red Onions is simply terrific and we would like to invite you to party with us starting at 5:00 Thursday nights at our new Blog Strut Peacock Style Link Party. Share your creative ideas, recipes, and any other family friendly content . If you have a giveaway or contest you’d like to promote, feel free to post it on our giveaway page. Come on over and show us what you’ve got! http://www.mypersonalaccent.com/the-blog-strut-peacock-style-6/
Awesome – I was taught to make these from my ex-husband’s family. Pickled onions were our favorite on tacos, enchiladas and tostadas. Thanks for linking up at My Favorite Posts Show Off Weekend Party!
Michelle @ On A Wing And A Prayer
What a great idea – I have never thought of pickling my own onions! Thanks for linking up with us at Tasty Tuesdays this week! Ruth x
Your pickled red onions seem to be the perfect way to eat red onions and I have got to give this a try. I found your post on rand recipe round up by MY Mixing Spoon.
My mouth is watering! I will be making some this week for sure!