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Pickled red onion slices on a fork over a jar of onions.

Quick Pickled Red Onions

Easy recipe for pickled red onions.
Prep Time 15 minutes
Total Time 15 minutes
Servings 1 pint

Ingredients

  • 1 medium red onion sliced, about 2 cups
  • 1 cup apple cider vinegar
  • 1 cup water
  • 2 tablespoons sugar
  • 1 teaspoon salt

Optional Seasonings

  • 1/2 teaspoon black peppercorns
  • 1/2 teaspoon mustard seeds
  • 1 stick cinnamon stick
  • 1 clove garlic smashed
  • 1/4 teaspoon red pepper flakes

Instructions

  1. Place red onion slices into a 16 ounce (pint) jar. If you’re adding seasonings, add them to the jar now.

  2. Combine apple cider vinegar, water, sugar, and salt. Bring to a boil. Remove the brine from the heat and let cool for a few minutes.
  3. Carefully pour brine into jar, covering the onion slices.
  4. Let cool at room temperature for about an hour. Place a lid or cover on the jar and refrigerate for two days before enjoying. Store the red onions in the refrigerator. They keep for about 2 weeks.