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Quick Pickle Red Onion

Published: Jul 23, 2025 · Modified: Aug 2, 2025 by The Gold and Grain · This post may contain affiliate links · Leave a Comment

This quick pickle red onion recipe is so easy, you'll never need to buy pickled red onions again! A combination of red wine vinegar, salt, sugar and a couple of aromatics, pickles sliced red onions just in time for dinner.

I always thought pickling was a long process that required equipment I didn't have and time I couldn't find, but this recipe has changed my thoughts. The pickling ingredients are simple, and then the jar or mixing bowl is simply filled with hot water, so this amount can vary depending on the size of the jar/bowl.

Even so, the result is delicious quick pickled red onions that we add to tacos, burgers, salads and sandwiches. A great little staple that can keep in the fridge for 3-4 days.

close up of quick pickled red onions in a jar

These pickled red onions are great all year round.

Jump to:
  • Ingredients
  • Instructions
  • Substitutions and Variations
  • Equipment
  • Storage
  • Related
  • Pairing
  • Quick Pickle Red Onion

Ingredients

ingredients for quick pickled red onions
  • red wine vinegar - this is my preferred acid to use in this recipe, vinegar is a must for pickling
  • salt - the salt adds a bit of brininess to the pickling mixture
  • sugar - the sweetness balances out the tart vinegar
  • peppercorns - for flavour, but can be omitted if you prefer
  • mustard seeds - again, for flavour but if you don't have them, they can be left out

See recipe card for quantities.

Instructions

close up of red pickled onions in a jar
  1. Step 1: Put the red onion, salt, sugar, peppercorns, mustard seeds and vinegar into a jar, then fill with hot water

Hint: thinly slice the red onions so the pickling liquid softens them quicker. Thicker pieces of red onion take longer to soften.

Substitutions and Variations

This is a quick pickle recipe, its not complicated, so experiment a little with variations in flavour, here are some of my suggestions;

  • Chilli - if the peppercorns aren't enough, slice a red chilli in half and add that to the pickling mixture, this will add more heat and spice to the red onions
  • Vinegar - red wine vinegar is my preference, and the colour compliments the red onion, but you can use white wine vinegar or white vinegar
  • Peppercorns and mustard seeds - if you don't want the little hints of mustard seed and peppercorns, you can omit them and the onions still turn out great

Equipment

If I'm not collecting jars from my used groceries, I'm buying them and re using them in whatever way I can. Its much better for the environment and easier on the wallet too. But sometimes, you need a good jar for a specific recipe of pantry staple, and these are my go to. I love these Weck jars, they come in great sizes and prices, and I must say, they look great too!

Storage

Store the pickled onions in the brine, in a jar for up to 3-4 days in the fridge. Always ensure the red onions are fully submerged in the pickling liquid before returning the jar to the fridge.

Related

Looking for other recipes like this? Try these:

  • Shallot Vinaigrette
  • Ginger and Tahini Dressing

Pairing

These are my favourite dishes to serve with quick pickle red onions:

  • Smashed Potatoes
  • Crispy Rice Salad

Quick Pickle Red Onion

Print Recipe Pin Recipe
Prep Time 10 minutes mins
Cook Time 15 minutes mins
Total Time 25 minutes mins
Servings: 4 people
Ingredients Method

Ingredients
  

  • 1 large red onion, thinly sliced
  • 2 tablespoon red wine vinegar
  • 1 teaspoon sea salt
  • 1 teaspoon caster sugar
  • ½ teaspoon peppercorns
  • ¼ teaspoon mustard seeds
  • 1 C hot water

Method
 

  1. Ina clean jar or small bowl, place the sliced red onion, sea salt, sugar, peppercorns, mustard seeds and red wine vinegar. Give it a little stir.
  2. Pour hot water over the top, to fill the jar or bowl ( this amount will vary but should be more than 1 cup.
  3. Allow to steep for at least 15 minutes before consuming. Enjoy!

More Preserves, Relish and Jam

  • Ghee
  • Beetroot Relish

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I'm Dan. I love cooking for my family using seasonal vegetables and fruit. Thanks for popping in!

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