These Quick Pickled Onions are an easy, flavorful way to brighten salads, burrito bowls, sandwiches, tacos, and many Latin-inspired meals. Made with simple pantry ingredients in just a few steps, they develop a tangy-sweet crunch and keep well in the refrigerator for up to two weeks. Their bright pink color and lively flavor make them an instant meal upgrade.
Layering flavor is one of my favorite tricks for making plant-based dishes taste irresistible, and quick pickled red onions are a no-fuss, budget-friendly tool for doing just that. With minimal prep—under five minutes to slice and assemble—you can keep a jar of these in the fridge to finish everything from bowls and wraps to grilled proteins and tacos.
I use apple cider vinegar here for its mild, fruity tang, but distilled white or other vinegars can substitute if needed. A touch of sugar balances acidity, salt forms the brine and helps preserve crispness, and a few fennel seeds add a subtle aromatic note. The result is a versatile condiment that lifts flavors without overpowering them.
Try them on sandwiches, salads, bowls, or any dish that could use a bright, acidic contrast. They’re included in my cookbook because they’re that useful—once you make a batch, you’ll find countless ways to use them.
Ingredients
Onions: One large red onion, thinly sliced for vivid color and a mild bite. A Vidalia onion works well if you prefer a sweeter result.
Apple Cider Vinegar: One cup. It pickles the onions and mellows their sharpness. You can substitute distilled white vinegar if needed.
Sugar: Two tablespoons to balance the acidity.
Salt: One teaspoon to help form the brine, keep the onions crisp, and season the pickles.
Fennel Seeds: 1/2 teaspoon, optional, for a gentle aromatic lift.
Recipe Variations
Customize these pickled onions to suit your taste:
Mixed Veggies: Add sliced carrots, cauliflower florets, red pepper strips, or celery to create a quick mixed pickle.
Swap Vinegars: Use red wine vinegar for a bolder flavor, or white wine/white balsamic for a milder result—especially nice with sweet onions.
Add Heat: Drop in a thinly sliced jalapeño or Thai chile for spice.
Extra Aromatics: Try whole spices like peppercorns, cumin, or coriander, or fresh herbs such as cilantro stems, rosemary, or thyme to vary the flavor profile.
How to Pickle Onions
Quick pickling is straightforward and fast. Follow these steps for crisp, tangy onions:
- Slice the onions: Use a mandoline or a sharp knife to cut the onion into thin rounds or half-moons. Thinner slices pickle faster and more evenly.
- Make the brine: Whisk together the vinegar, sugar, salt, and fennel seeds in a bowl or measuring cup until the sugar dissolves.
- Pack the jar: Place the sliced onions into a 24–32 ounce glass jar and pour the brine over them. Press the onions down so they are completely submerged.
- Pickle: Seal the jar and let it rest at room temperature for about 1 hour, or until the onions are tender. For quicker results, warm the vinegar slightly (see tips), then allow about 30 minutes.
Jenné’s Recipe Tips
- Slice evenly: Uniform thickness helps the onions pickle consistently. Aim for about 1/6-inch slices.
- Refrigerate after pickling: If not using immediately, cover and refrigerate the jar after the onions have sat at room temperature for about an hour.
- Warm brine option: Gently warming the vinegar for 1–2 minutes helps dissolve the sugar and speeds pickling (about 30 minutes). Avoid boiling, which can soften the onions too much.
Storage Directions
Store pickled onions in an airtight container in the refrigerator for up to three weeks. Their texture will soften slightly over time, but they retain great flavor. Do not freeze pickled onions.
Frequently Asked Questions
Yes. Sugar is optional and softens the sharpness of the vinegar. Omitting it yields a brighter, punchier pickle and makes the recipe free of processed sugar.
This quick refrigerator pickling method is not formulated for shelf-stable home canning. Use a tested canning recipe and proper canning procedures if you want long-term storage.
More Condiments and Meal Toppers
- Avocado Dressing
- Pecan Muhammara
- Miso Tahini Dressing
- Mango Guacamole
- Vegan Sour Cream
- Carrot Top Pesto
Quick Pickled Red Onions
Equipment
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mandoline slicer recommended
Ingredients
- 1 cup apple cider vinegar
- 2 tbsp sugar
- 1 tsp salt
- 1/2 tsp fennel seeds optional
- 1 large red or Vidalia onion, thinly sliced (about 1/6 inch)
Instructions
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Thinly slice the onion into rounds or half-moons using a mandoline or sharp knife. Thinner slices pickle faster.
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Whisk together the vinegar, sugar, salt, and fennel seeds until the sugar dissolves.
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Pack the sliced onions into a 24–32 ounce glass jar and pour the brine over them. Press down so the onions are fully submerged.
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Seal the jar and let it sit at room temperature for about 1 hour, until the onions are tender. Refrigerate if not using right away.
Notes
Store in an airtight container in the refrigerator for up to three weeks. Texture will soften over time; these do not freeze well.
Recipe Pro-Tips
- Slice evenly: Aim for consistent thickness so the onions pickle uniformly.
- Refrigerate after pickling: Once the onions have rested at room temperature about an hour, cover and refrigerate if not using right away.
- Warm brine option: Gently warm the vinegar for 1–2 minutes to dissolve sugar faster and reduce pickling time to about 30 minutes. Do not boil.
Nutrition
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Carbohydrates: 5g
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Protein: 0.2g
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Fat: 0.04g
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Sodium: 293mg