Pickled onions are a quick and vibrant condiment that adds a zesty crunch to countless dishes. With just a few ingredients and minutes of prep, you can transform humble onions into a punchy topping for tacos, sandwiches, salads, and more. This easy pickled onion recipe is fast, foolproof, and endlessly adaptable to your tastes.
Ingredients
- 1 large red onion (about 250g/9oz)
- 3/4 cup (180ml) apple cider vinegar
- 1/4 cup (60ml) water
- 1 tablespoon granulated sugar
- 1 1/4 teaspoons kosher salt (or 1 teaspoon fine sea salt)
- Optional: 5-6 whole black peppercorns
- Optional: 1 clove garlic, peeled and halved
- Optional: 1/2 teaspoon mustard seeds or coriander seeds
Instructions
- Prepare the onion: Peel the red onion and slice it thinly into half-moons or rings, about 1/8-inch (3mm) thick. A mandoline slicer works well for even slices, but a sharp knife is also fine.
- Pack the onion: Place the sliced onion in a clean pint-sized (16oz/475ml) glass jar. If using, add the optional garlic, peppercorns, and seeds.
- Make the brine: In a small saucepan, combine the apple cider vinegar, water, sugar, and salt. Heat over medium, stirring, just until the sugar and salt dissolve (do not boil). Remove from heat.
- Pour and submerge: Carefully pour the hot brine over the onions in the jar. Use a spoon to press the onions down so they are fully submerged. If needed, top off with a little extra water or vinegar to cover.
- Cool and refrigerate: Let the jar cool to room temperature (about 20-30 minutes), then seal with a lid and refrigerate. The onions will be lightly pickled and ready to eat in about 30-60 minutes, but their flavor improves after a few hours. For best results, chill at least 2 hours or overnight.
- Serve: Use a fork or tongs to remove pickled onions as needed. Always keep the onions refrigerated.
Tips
- Vinegar choices: Apple cider vinegar gives a mellow tang, but you can substitute white wine vinegar, red wine vinegar, or distilled white vinegar for a sharper flavor.
- Onion types: Red onions are classic for their color and mildness, but yellow or sweet onions also work. Shallots will give a more delicate taste.
- Sweetness: Adjust the sugar to taste. For less sweet pickles, use 2 teaspoons. For a sweeter profile, increase to 1.5 tablespoons.
- Storage: Always use a clean jar and ensure onions are covered in brine to prevent spoilage.
Serving Suggestions
- Tacos and burritos: Add a tangy crunch to carnitas, fish tacos, or veggie burritos.
- Sandwiches and burgers: Layer pickled onions onto burgers, grilled cheese, or deli-style sandwiches for brightness.
- Salads and grain bowls: Scatter over leafy greens, grain bowls, or roasted vegetables for a punch of flavor.
- Charcuterie boards: Serve alongside cheeses, cured meats, and olives for a zesty accent.
- Egg dishes: Top avocado toast, scrambled eggs, or frittatas with a few ribbons of pickled onion.
Variations
- Spicy pickled onions: Add a few slices of fresh jalapeño, serrano, or a pinch of crushed red pepper flakes to the jar for heat.
- Citrus twist: Replace half the vinegar with fresh lime juice for a bright, tart flavor—great for Mexican dishes.
- Herb-infused: Add a sprig of fresh thyme, oregano, or dill to the jar for an aromatic touch.
- Pickled shallots: Use thinly sliced shallots in place of onion for a milder, more delicate pickle—ideal for salads and seafood.
- Pickled with beets: Add a few thin slices of raw beet to the jar for a deeper pink color and earthier flavor.
Storage and Reheating
- Refrigerator: Store pickled onions in their brine in a sealed jar in the refrigerator. They are best enjoyed within 2-3 weeks for peak flavor and crunch.
- Serving: No reheating is needed. Pickled onions are served cold or at room temperature. Always use a clean utensil to remove onions from the jar to prevent contamination.
- Discard if: The onions develop off smells, visible mold, or the brine becomes cloudy or slimy. Always err on the side of caution.
Frequently Asked Questions
- Can I use white or yellow onions instead of red?
- Yes! White or yellow onions can be pickled with the same method. Red onions are preferred for their color and mildness, but other varieties work well. Yellow onions tend to be sharper, while sweet onions (like Vidalia) will yield a gentler, less pungent pickle.
- How long do pickled onions last in the refrigerator?
- When made with hot brine and kept submerged in a clean, sealed jar, pickled onions will keep for 2-3 weeks in the refrigerator. Over time, they may lose some crunch and brightness but remain safe to eat as long as there are no signs of spoilage.
- Why did my pickled onions turn soft or mushy?
- This usually happens if the onions were sliced too thickly, left to sit in hot brine for too long, or stored for too many weeks. For crisp onions, slice thinly and avoid boiling the onions in the brine. Always refrigerate promptly after cooling.
- Can I reuse the pickling brine?
- You can reuse the brine once to pickle a new batch of onions (within a week), but the flavor and acidity may be weaker. For food safety, always bring reused brine to a boil and cool before pouring over fresh onions. Discard brine after two uses or if it looks cloudy or smells off.
- Is it safe to can pickled onions for pantry storage?
- This recipe is intended for refrigerator pickles only, not for shelf-stable canning. For safe long-term storage at room temperature, use a tested, high-acid pickled onion recipe that is approved for water bath canning, and always follow USDA guidelines. Low-acid vegetables require pressure canning to avoid botulism risk.
- Can I make pickled onions without sugar?
- Yes, you can reduce or omit the sugar if you prefer a sharper, less sweet pickle. The sugar helps balance the acidity and enhances the onion’s flavor, but it is not required for preservation. Start with half the sugar or none, and adjust to taste.