Bright, tangy, and incredibly versatile, homemade pickled onions are one of the easiest ways to add bold flavour to your favourite meals. With their crisp texture and vibrant pink colour, they make the perfect topping for tacos, burgers, sandwiches, salads, grain bowls, and grilled meats. Using just a few pantry staples, these quick pickled onions come together in minutes and develop even more flavour as they chill.
Classic Homemade Pickled Onions
This quick refrigerator pickled onion recipe creates perfectly crisp, flavourful onions with the ideal balance of sweetness and acidity.
Ingredients
- 1 large red onion, thinly sliced
- 1 cup white vinegar
- 1 cup water
- 1 tbsp granulated sugar
- 1½ tsp kosher salt
- 2 cloves garlic, peeled (optional)
- 1 tsp black peppercorns
- ½ tsp mustard seeds (optional)
Instructions
1. Slice the Onion
Peel the red onion and slice it into thin, even rings or half-moons using a sharp knife. Place the sliced onion into a clean glass jar.
2. Prepare the Brine
In a small saucepan, combine the white vinegar, water, sugar, and kosher salt. Heat over medium heat, stirring until the sugar and salt have completely dissolved.
3. Fill the Jar
Add the garlic, black peppercorns, and mustard seeds to the jar if using. Carefully pour the warm brine over the onions until they are fully submerged.
4. Cool
Allow the jar to cool to room temperature before sealing it with a lid.
5. Chill & Serve
Refrigerate the onions for at least one hour before serving. For the best flavour, let them pickle overnight. Store in the refrigerator for up to three weeks.
Why This Recipe Works
Red onions naturally become milder as they pickle, while the vinegar provides a bright, tangy flavour that complements a wide variety of dishes. A touch of sugar balances the acidity without making the onions overly sweet, and simple spices like peppercorns and mustard seeds add subtle depth. The quick refrigerator method keeps the onions crisp while allowing them to absorb plenty of flavour in just a short amount of time.
Tips for the Best Pickled Onions
- Slice the onions as evenly as possible so they pickle consistently.
- Use a mandoline slicer for extra-thin, uniform slices if available.
- Let the onions chill overnight for the most developed flavour.
- Add fresh herbs, chilli flakes, or whole spices to customise the brine.
- Always keep the onions fully submerged in the liquid to maintain freshness.
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