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Quick pickled red onions in jar

Quick Pickled Red Onions

Tangy, crunchy, and sweet, these quick pickled red onions are the perfect topping for salads, burritos, sandwiches, or burgers. With just a few simple ingredients, they can be made in minutes and are ready to eat within an hour.
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Course: Condiment
Cuisine: Mexican
Keyword: Pickled onions, pickled red onions, quick pickled onions
Prep Time: 10 minutes
Resting Time: 1 hour
Total Time: 1 hour 10 minutes
Servings: 1 pint size jar
Calories: 25kcal

Equipment

  • 1 pint size jar or airtight container (2 cups)

Ingredients

  • 1 (150 g) red onion, sliced thin
  • 2/3 cups (160 mL) apple cider vinegar
  • 1.5 tablespoons (32 g) honey, or real maple syrup
  • 1 teaspoon Diamond Crystal Kosher salt (see notes)
  • 1/2 teaspoon mustard seeds, optional

Instructions

  • Slice the red onion very thinly and set aside.
  • In a 2-cup jar, combine the apple cider vinegar, honey, salt, and mustard seeds (optional). Stir until well mixed.
  • Add the sliced onions to the jar, pressing them down to fully submerge them in the liquid. If needed, add 1 to 2 tablespoons more apple cider vinegar to ensure the onions are completely coated.
  • Seal the jar and flip it upside down a few times to ensure the onions are fully coated. Let the onions sit at room temperature for about 1 hour.
  • Once pickled, transfer the jar to the refrigerator to chill. The onions will be best enjoyed cold.

Notes

  • Adjusting Sweetness: You can use honey or real maple syrup as the sweetener, but feel free to adjust the amount to your taste.
  • Flavor Variations: Mustard seeds are optional, but you can also experiment with fennel seeds, red pepper flakes, or fresh herbs like rosemary to customize the flavor.
  • Storage: The pickled onions are best enjoyed cold. Store them in an airtight container in the refrigerator for up to 2–3 weeks.
  • Substitute for Sweetener: If you don’t have honey or maple syrup, you can use white sugar as a substitute, keeping the same ratio (1.5 tablespoons).

Nutrition

Calories: 25kcal