A vibrant jar of pickled red onions brings bright color, tang, and crunch to many dishes. This sweet-tart garnish lifts sandwiches, burgers, tacos, and salads, and it’s quick to make — you’ll find yourself reaching for it from the fridge again and again.
Pickled red onions are one of those simple garnishes that instantly add character to a meal. Their bright fuchsia hue, crisp texture, and balanced sweet-and-sour flavor make them a versatile pantry staple.
Why these Quick Pickled Red Onions are great
Bold color: The vivid pink-purple from red onions gives dishes an attractive pop.
Crunchy texture: The quick pickling process keeps the onions crisp and refreshing.
Balanced flavor: A blend of vinegar and sugar provides a zippy, slightly sweet tang that complements many ingredients.
Fast and easy: You can prepare these in under 10 minutes and they’ll keep in the refrigerator for weeks.
Minimal ingredients: This recipe uses just a handful of common pantry items.
Ingredients
Red onions
The bright color and mild, slightly sweet flavor come from red onions. Yellow or white onions can be used, but they won’t deliver the same color or the same subtle sweetness. Choose onions that feel heavy for their size, are firm, and free of soft spots or discoloration. Store unpeeled onions in a cool, dry, dark place until you’re ready to use them.
To slice, cut the onion in half and slice into 1/4-inch-thick half-moon slivers.
Vinegar
Vinegar is the pickling agent. White balsamic is used here because of its mild, sweet-tart profile with a light floral finish that won’t overpower the onions. If you prefer, substitute white wine vinegar or apple cider vinegar. Avoid regular dark balsamic for this quick pickle, as it can be too strong.
Sweetener
Granulated white sugar balances the vinegar. For a low-carb alternative, a direct swap with a granular sugar substitute such as xylitol works well and measures 1:1.
Salt
About 1/2 teaspoon of kosher salt helps enhance the overall flavor.
Whole allspice
Add 7–8 whole allspice berries for a warm, aromatic note that hints at cinnamon, clove, and pepper.
How to make quick pickled red onions
These pickled onions require minimal prep. Bring 1 1/2 cups of water to a boil in a small saucepan, then remove from heat and add the sliced onions. Stir and let sit for five minutes, then drain.
Place the drained onions into a clean jar. Whisk together the sugar, salt, and 1/2 cup white balsamic vinegar, then pour the mixture over the onions. Add the allspice berries, seal the jar, and refrigerate overnight so the flavors meld. That’s it — simple and effective.
Storage
Keep the jar refrigerated. For best texture and flavor, enjoy within three days, though they remain usable for up to three weeks.
Variations and additions
Peppercorns: Add whole peppercorns for a peppery bite.
Herbs: Fresh sprigs of rosemary, thyme, or oregano, or a couple bay leaves, add an herbal depth.
Heat: Sliced jalapeños and a pinch of red pepper flakes introduce spice.
Garlic: A few peeled garlic cloves lend savory dimension.
These pickled onions work beautifully across cuisines. Use them to top fish tacos, burgers, pulled pork sandwiches, or fresh salads. They’re a simple way to add brightness and textural contrast to everyday meals.
A perfect complement to a watermelon arugula salad with feta, or piled on a pulled pork sandwich for extra crunch and tang.
Quick and Easy Pickled Red Onions
A gorgeous jar of pickled red onions adds bright color and a sweet-tart crunch to many dishes.
- Author: Kristy Murray
- Prep Time: 5 minutes
- Cook Time: 5 minutes
- Total Time: 10 minutes
- Yield: 10 servings
- Category: Garnishment
- Method: Pickling
- Cuisine: American
Ingredients
- 1 large red onion, sliced ¼ inch thick into half-moon slivers
- 1 ½ cups water
- 2 tablespoons sugar (or xylitol/xylosweet for keto)
- ½ teaspoon kosher salt
- ½ cup white balsamic vinegar (or white wine/apple cider vinegar)
- 7–8 whole allspice berries
Instructions
- Bring 1 ½ cups water to a full boil in a small saucepan.
- Remove from heat and add the sliced onion. Stir and let sit for 5 minutes.
- Drain the onions and transfer them to a clean jar.
- Whisk together the sugar, kosher salt, and white balsamic vinegar. Pour over the onions.
- Add the allspice berries, seal the jar, and refrigerate overnight to marinate.
- Enjoy the next day—store refrigerated and use within three weeks for best quality.
Notes
- Choose firm, heavy red onions without soft spots or discoloration.
- White balsamic is mild and slightly sweet; white wine or apple cider vinegar are good substitutes.
- For a keto-friendly version, swap sugar for a 1:1 granular sweetener like xylitol.
- Store refrigerated; best within three days but good up to three weeks.
- Optional add-ins: peppercorns, rosemary, thyme, bay leaves, jalapeño slices, red pepper flakes, or garlic cloves.
Nutrition
- Serving Size: Forkful
- Calories: 17
- Sugar: 3 g
- Sodium: 58 mg
- Fat: 0 g
- Carbohydrates: 4 g
- Protein: 0 g
Enjoy these pickled red onions to brighten salads, tacos, sandwiches, and more — an easy, flavorful way to elevate everyday meals.