Learn How to Make Pickled Onions at home with this simple, reliable recipe. These tangy pickled red onions bring bright flavor, a pleasant crunch, and a vibrant color to tacos, sandwiches, salads, grilled dishes, and more.
What are Pickled Red Onions?
Pickled red onions are thin slices of red onion preserved in a vinegar-based brine. Pickling softens the raw bite of the onion and replaces it with a lively tang, often balanced by a touch of sweetness. The technique has long been used to preserve and flavor vegetables and appears in many cuisines worldwide. A basic brine contains vinegar, water, salt, and sugar, and you can customize it with spices, aromatics, or herbs to suit your taste.
Ingredients You Need
- Red onion – Thinly sliced so the brine penetrates quickly.
- Apple cider vinegar or white vinegar – Provides the acidic base and bright flavor.
- Water – Dilutes the vinegar for a balanced brine.
- Granulated sugar – Balances acidity with a hint of sweetness.
- Kosher salt – Enhances flavor and helps preserve the onions.
- Garlic clove (optional) – Adds savory depth when smashed or sliced.
- Black peppercorns (optional) – Give a gentle heat and aroma.
- Mustard seeds (optional) – Provide a warm, earthy note.
- Fresh herbs (optional) – Thyme, dill, or other herbs add fragrance.
How to Make Pickled Red Onions
- Slice the onion. Peel and slice the red onion thinly into rings or half-moons.
- Make the brine. In a small saucepan combine the vinegar, water, sugar, and salt. Add optional aromatics—garlic, peppercorns, mustard seeds, or fresh herbs—if using.
- Heat until dissolved. Warm the mixture over medium heat until the sugar and salt dissolve and it reaches a gentle simmer.
- Combine with the onions. Place the sliced onions in a heatproof jar or container and pour the hot brine over them, ensuring the onions are fully submerged.
- Cool and refrigerate. Let the jar sit at room temperature until the liquid cools, then seal and refrigerate. The onions will be ready in about an hour and improve in flavor after a few hours or overnight.
- Serve. Use the pickled onions as a garnish or condiment on tacos, sandwiches, salads, grilled meats, grain bowls, or cheese boards.
Variations
- Spicy: Add sliced jalapeños, red pepper flakes, or a dash of hot sauce to the jar.
- Different vinegar: Try red wine vinegar for a slightly different acidity and color.
- Ginger: Thin slices of fresh ginger give a bright, warm twist.
- Herb blends: Swap thyme or dill for rosemary, basil, or cilantro for varied aroma.
Can I Store Leftovers?
Yes. Store pickled red onions in a sealed jar in the refrigerator. They keep well for up to two weeks; they may soften slightly over time but remain flavorful. Freezing is possible for up to three months, but thawed onions will lose their crispness, so refrigeration is the preferred method.
Common Questions about Pickled Red Onions
Yes. Their bright acidity and crunchy texture cut through rich, fatty fillings and add a refreshing contrast to tacos.
They are tangy rather than overwhelmingly sour. A small amount of sugar or honey in the brine balances the acidity for a pleasant, rounded flavor.
Absolutely. Add sliced chiles, red pepper flakes, or hot sauce to the brine for heat that complements many savory dishes.
Yes. They pair well with roasted meats, grain salads, charcuterie, and anything that benefits from a bright, acidic counterpoint.
Quick Pickled Onions Recipe
Ingredients
- 1 medium red onion, thinly sliced
- 1/2 cup (120 ml) apple cider vinegar or white vinegar
- 1 cup (240 ml) water
- 1 tablespoon (12 g) granulated sugar
- 1 1/2 teaspoons (9 g) kosher salt
- Optional: 1 garlic clove, peeled and smashed
- Optional: 1/2 teaspoon black peppercorns
- Optional: 1/2 teaspoon mustard seeds
- Optional: 1–2 sprigs fresh herbs such as thyme or dill
Instructions
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Peel and thinly slice the red onion into rings or half-moons.
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In a small saucepan, combine the vinegar, water, sugar, and salt. Add any optional seasonings like garlic, peppercorns, or mustard seeds.
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Bring the mixture to a simmer over medium heat, stirring until the sugar and salt are dissolved.
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Place the sliced onions in a heatproof jar. Pour the hot brine over the onions, ensuring they are fully submerged.
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Let the jar cool at room temperature for about 30 minutes. Once cooled, seal and refrigerate. The onions are ready in about 1 hour but taste best after several hours or overnight.
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Store refrigerated for up to 2 weeks.
Equipment
Nutrition
Nutrition information is an approximation and should be used as a guide.