🧅 Quick Pickled Red Onions
Crisp, tangy, slightly sweet, and beautifully vibrant, these Quick Pickled Red Onions are the easiest way to add a bright punch of flavor to tacos, burgers, sandwiches, salads, bowls, and more.
Thinly sliced red onions are soaked in a simple vinegar brine made with white vinegar, water, cane sugar, and sea salt. After just a short time, the onions become pleasantly tangy while still retaining a satisfying crunch.
They’re incredibly versatile and can be prepared ahead of time for easy meal prep.
⏱️ Recipe Information
Prep Time: 10 minutes
Brining Time: 30 minutes minimum
Total Time: 40 minutes
Yield: About 1 large jar
Difficulty: Easy
Method: Quick Pickling / Refrigerator Pickles
🛒 Ingredients
- 2 small red onions, thinly sliced
- 2 cups (480 ml) white vinegar
- 2 cups (480 ml) water
- ⅓ cup (67 g) cane sugar
- 2 tablespoons sea salt
🌿 Optional Flavor Additions
Choose any combination you like:
- 1 teaspoon black peppercorns
- ½ teaspoon red pepper flakes
- 2 garlic cloves, sliced
- 1 bay leaf
- 1 teaspoon mustard seeds
- A few fresh dill sprigs
- Thinly sliced jalapeño
- A strip of lemon or lime peel
👩🍳 Instructions
1. Prepare the Onions
Peel the red onions and slice them as thinly and evenly as possible.
A sharp knife or mandoline slicer works well.
Thin slices pickle faster and become more tender while retaining some crunch.
2. Pack the Jar
Place the sliced onions into a clean 1-quart (1-liter) glass jar.
Press them down gently so they’re packed but not crushed.
Add any optional flavorings, such as garlic, peppercorns, bay leaf, chili flakes, or mustard seeds.
3. Make the Pickling Brine
Add the white vinegar, water, cane sugar, and sea salt to a medium saucepan.
Place over medium heat.
Stir until the sugar and salt have completely dissolved.
The mixture only needs to become hot enough to dissolve the seasonings; it doesn’t need a vigorous boil.
4. Pour the Brine Over the Onions
Carefully pour the hot brine over the onions.
Make sure the onions are fully submerged.
Use a clean spoon to gently press them below the liquid if necessary.
Leave a little headspace at the top of the jar.
5. Cool
Allow the jar to sit uncovered at room temperature for approximately 20–30 minutes, until it has cooled substantially.
Don’t seal a jar of very hot liquid tightly.
6. Refrigerate
Once cooled, seal the jar with a clean lid and refrigerate.
The onions will begin developing their pickled flavor quickly.
For the best balance of flavor and texture, refrigerate for at least 30 minutes, though 2–4 hours gives a stronger pickle.
For the most developed flavor, refrigerate overnight.
7. Serve
Remove the onions from the refrigerator and add them straight to your favorite dishes.
They’re especially delicious piled onto tacos, burgers, sandwiches, salads, grain bowls, grilled meats, and avocado toast.
⭐ Chef’s Tips
Slice evenly
Uniformly thin slices pickle at the same rate and make the finished onions easier to eat.
Don’t skip the sugar
The sugar balances the sharp acidity of the vinegar without making the onions taste overly sweet.
Keep the onions submerged
Any onions above the brine won’t pickle evenly and can deteriorate faster.
Taste after a few hours
The flavor develops over time. After a few hours, they’ll be tangy and crisp; overnight, they’ll be more deeply pickled.
Add extra crunch
For very crisp onions, allow the brine to cool slightly before pouring it over the onions rather than using it piping hot.
Make them your own
Garlic, chili flakes, peppercorns, dill, jalapeño, and citrus peel can completely change the flavor while keeping the basic recipe the same.
🌶️ Easy Variations
Spicy Pickled Red Onions
Add ½–1 teaspoon red pepper flakes or several slices of fresh jalapeño.
Garlic Pickled Onions
Add 2–3 thinly sliced garlic cloves to the jar.
Herbed Pickled Onions
Add fresh dill, thyme, or oregano.
Citrus Pickled Onions
Add a few strips of lime or lemon zest for a bright citrus note.
Sweet Pickled Onions
Increase the cane sugar to ½ cup for a noticeably sweeter pickle.
Mexican-Style
Add a pinch of oregano, a few black peppercorns, and fresh jalapeño slices.
🌮 What to Serve With Pickled Red Onions
These onions are fantastic on:
- Tacos
- Burritos
- Quesadillas
- Burgers
- Hot dogs
- Grilled cheese
- Pulled pork
- Fried chicken
- Steak
- Grain bowls
- Rice bowls
- Salads
- Avocado toast
- Breakfast sandwiches
- Charcuterie boards
They add a bright, acidic contrast to rich or savory foods.
🧊 Storage
Keep the pickled onions refrigerated at all times.
Store them in a clean, airtight glass jar and use within approximately 2–3 weeks for the best quality.
Always use a clean utensil when removing onions from the jar.
This recipe is for refrigerator pickles and is not a shelf-stable canning recipe.
🧅✨ Final Result
These Quick Pickled Red Onions are crisp, tangy, slightly sweet, and incredibly versatile.
The sharpness of the red onion mellows beautifully in the simple vinegar brine, creating a condiment that instantly brightens almost any savory meal.
Keep a jar in the fridge and you’ll always have a quick flavor boost ready to go! 🧅🌮🥗✨