Quick Pickled Red Onions Recipe

I made Quick Pickled Red Onions that slap onto tacos, sandwiches, and anything dull to give it a tangy, snappy punch you’ll actually reach for in the fridge.

I adore quick pickled red onions because they slap so much life into boring food. I toss them on tacos, sandwiches, burgers, whatever needs a bright hit.

I’m obsessed with that snap from red onions and the sharp kiss of apple cider vinegar. Pickled Red Onions Mexican Style?

Yes please, they make tacos feel alive. I love how they cut through fatty food and add a pop that won’t get shy in the fridge.

Quick Pickled Red Onions are my secret stash. I keep a jar handy and raid it like it’s contraband.

No shame, I snack straight from jar.

Ingredients

• Red onions: crunchy, sharp bite that turns brilliant pink and adds fresh zing.
• Apple cider vinegar: it’s the tangy backbone, a little sweet and fruity, brightens everything.
• Water: it tames acidity, keeps things crisp, makes slices more pickled not soggy.
• Basically sugar: softens bite, adds gentle sweetness, balances the sharpness.
• Plus salt: pulls out flavor, keeps texture firm, brings everything together.

Ingredient Quantities

• 2 medium red onions, peeled and thinly sliced (about 12 ounces)
• 1 cup apple cider vinegar
• 1 cup water
• 1 to 2 tablespoons granulated sugar, depending on how sweet you like it
• 1 teaspoon kosher salt (or 3/4 teaspoon fine table salt)

How to Make this

1. Slice the 2 medium red onions thinly, root to tip, about 1/8 inch thick; you can use a sharp knife or a mandoline if you got one, but be careful, they’re slippery.

2. Put the sliced onions into a clean pint jar or any glass container that holds about 2 cups.

3. In a small saucepan combine 1 cup apple cider vinegar, 1 cup water, 1 to 2 tablespoons granulated sugar (start with 1 and add more if you like sweeter), and 1 teaspoon kosher salt or 3/4 teaspoon fine table salt.

4. Heat the vinegar mixture over medium heat just until the sugar and salt dissolve and the liquid is steaming; do not boil it for a long time, a gentle simmer for 1 minute is enough.

5. Carefully pour the hot vinegar mixture over the onions in the jar, pressing the onions down so they are fully submerged; leave a little headspace at the top.

6. Let the jar cool to room temperature on the counter, then seal with the lid and shake gently to distribute the brine.

7. For quick use you can eat them after 30 minutes, but they taste much better after at least 2 hours or overnight in the fridge.

8. Store the pickled onions in the refrigerator for up to 2 weeks, always use a clean utensil to remove them so they last longer.

9. Tip: if you want crisper onions, plunge the sliced onions into ice water for 10 minutes before pickling, then drain well; add optional flavorings like peppercorns, garlic or a bay leaf if you want more complexity.

Equipment Needed

1. Sharp chef knife or mandoline
2. Cutting board
3. Pint jar or 2 cup glass jar with lid
4. Small saucepan
5. Measuring cups (1 cup)
6. Measuring spoons (tablespoon and teaspoon)
7. Tongs or a clean spoon to press and remove onions
8. Bowl for ice water and a colander or paper towels for draining (optional)

FAQ

Quick Pickled Red Onions Recipe Substitutions and Variations

• Apple cider vinegar: swap for red wine vinegar for a deeper, fruitier note, rice vinegar for a milder, less sharp flavor, or distilled white vinegar if you want a very bright, clean tang.
• Sugar: you can use honey or maple syrup (use slightly less by volume since they are sweeter), or a granular substitute like coconut sugar or a monk fruit blend for lower sugar.
• Kosher salt: use pickling or canning salt (no additives) for the clearest brine, sea salt works too but measure by weight if you can cause crystal sizes vary, or use 3/4 teaspoon fine table salt if that’s what you’ve got.
• Red onions: try thinly sliced shallots for a milder, more delicate bite, or use thin rings of white or sweet onions if red ones aren’t available — the color and intensity will change though.

Pro Tips

1) Slice evenly and don’t rush it. If your pieces are all different sizes some will get soggy while others stay crisp. A sharp knife helps a lot, and if you use a mandoline go slow or you’ll nick yourself.

2) For extra crunch, ice bath the slices for 10 minutes then dry them really well. If they’re even a bit wet the brine gets diluted and the texture suffers. Press the onions down in the jar so they’re fully submerged, or you’ll end up with floaters that don’t pickle right.

3) Taste as you go with the sugar. Start light, because the onions mellow overnight and can get sweeter. If you want more depth add a couple peppercorns or a garlic clove, but don’t overwhelm the vinegar, you want that bright tang to shine.

4) Keep everything clean and use a clean utensil each time you fish some out. Store in the fridge, and they’re best within two weeks. After that they’re OK but the color fades and the flavor goes flatter.