Pickled Red Onions on a taco with lime wedges.

Quick Pickled Onions

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If you want an easy way to add bright flavor, crunch, and a little tang to your meals, quick pickled onions are one of the best low carb kitchen staples you can make. They take only a few minutes to prepare, require simple pantry ingredients, and instantly elevate everything from tacos and burgers to salads and grilled meats.

These vibrant pink onions develop incredible flavor after just a few hours in the refrigerator and continue to get better over the next day or two. The combination of vinegar, salt, and peppercorns creates the perfect balance of tangy, savory, and slightly sweet flavor that cuts through rich foods beautifully.

One of the best things about quick pickled onions is how versatile they are. Keep a jar in your refrigerator and you’ll always have a fresh, flavorful topping ready to go.

Tips for the Best Pickled Onions

Slice the onions thinly

Thin slices absorb the pickling liquid more quickly and create the perfect tender-crisp texture.

Use a mandoline for consistency

A mandoline slicer helps create evenly thin slices, which allows the onions to pickle evenly and gives them a beautiful presentation.

Customize the flavor

You can easily add extra flavor to your pickled onions. Try one or more of these ingredients to mix things up:

  • Garlic cloves
  • Crushed red pepper flakes
  • Fresh dill
  • Mustard seeds
  • Bay leaves
  • Jalapeño slices

Use Regular Sugar if You Are Less Worried About aLow Carb Diet

For a less-strict low carb version, simply substitute real sugar (reduce the amount of sugar or use half sugar and half monk fruit or erythritol).

What to Serve with Quick Pickled Onions

These onions add freshness and acidity to rich, savory dishes and pair well with countless low carb meals.

Try them on:

Why Pickled Onions Work So Well in Low Carb Cooking

Low carb meals often rely on rich proteins, cheeses, creamy sauces, and healthy fats. Quick pickled onions help balance those flavors with acidity and crunch, making meals taste brighter and more satisfying without adding many carbs.

They are also an easy way to add color and restaurant-style flavor to everyday meals with very little effort.

Pickled Red Onions on a taco with lime wedges.
Print Recipe

Quick Pickled Onions

Prep Time15 minutes
Course: Condiment
Cuisine: American, Mexican
Keyword: pickled onions
Servings: 6

Equipment

  • 1 Mandoline
  • 1 Chef's Knife
  • 1 Cutting Board
  • 1 Mason Jar or Storage Container

Ingredients

  • 1 red onion, thinly sliced
  • 1 cup apple cider vinegar or champagne vinegar
  • 1 cup water
  • 1 tbsp kosher salt
  • 1 tbsp sugar substitute (monk fruit or erythritol)
  • 10-12 whole peppercorns

Instructions

  • Thinly slice the red onion and place it into a clean glass jar or sealed container.
  • In a medium bowl or measuring cup, combine the vinegar, water, kosher salt, sugar, and peppercorns. Stir well until the salt and sugar dissolve.
  • Pour the liquid mixture over the onions, making sure the onions are fully submerged.
  • Seal the container and refrigerate for at least 1 hour before serving. For the best flavor and color, allow the onions to pickle overnight.
  • Store in the refrigerator for up to 3 months.

Storage

Store quick pickled onions in a tightly sealed glass container in the refrigerator for up to 3 months. The onions will soften slightly over time while continuing to develop flavor.

The vibrant pink color deepens after the first 24 hours, making them as beautiful as they are delicious.

Frequently Asked Questions

How long do quick pickled onions last in the refrigerator?

Quick pickled onions can last up to 3 months when stored in a sealed container in the refrigerator. For the best flavor and texture, use clean utensils each time you serve them.

How soon can I eat pickled onions after making them?

Pickled onions are ready to eat after about 1 hour, but they taste even better after sitting overnight. The longer they marinate, the more vibrant the flavor and color become.

What kind of vinegar works best for pickled onions?

Apple cider vinegar and champagne vinegar both work beautifully for quick pickled onions. Apple cider vinegar creates a slightly bolder flavor, while champagne vinegar offers a lighter, more delicate taste.