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–+ servings
A glass jar of pickled sliced red onions with turquoise napkins beside the jar
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Pickled Red Onions

Pickled red onions take just 5 minutes to make with a few ingredients and keep for weeks in the fridge. Use with tacos, burgers, grain bowls and more!
Prep Time5 minutes
Additional Time1 hour
Total Time1 hour 5 minutes
Yield: 3 cups

Ingredients

  • 1 large red onion
  • 1 cup hot water
  • ½ cup apple cider vinegar
  • 1 tablespoon granulated sugar
  • 1 ½ teaspoons kosher salt

Instructions

  • Thinly slice the red onion using a mandolin or by hand, with a sharp knife. You want them about ⅛ inch thin and evenly sized. Stuff the red onion slices into a glass jar (a 24 oz. size is perfect). 
  • Combine the hot water, vinegar, sugar and salt in a small bowl and stir until thoroughly mixed and the sugar and salt are dissolved.
  • Pour the liquid over the onions in the jar, until the jar is filled and the onions are all submerged. (You can add some extra warm water to cover the onions if needed.)
  • Let the jar sit at room temperature for 45 minutes to an hour, until cooled down.
  • Cover and refrigerate until ready to use. These are best after at least a few hours in the fridge so the onions can pickle. The pickled red onions will keep, covered, in the refrigerator for up to 2-3 weeks.

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Notes

If you don’t have apple cider vinegar, you could substitute white wine vinegar.
These take just 5 minutes to make, but you’ll need to let them cool down at room temperature and then refrigerate them for a few hours for optimal flavor. So please plan ahead.
A 24-ounce size glass jar is perfect for holding an entire large red onion that’s been sliced. You could use a smaller jar if you have a smaller onion or are only using half of a red onion.
I use notch 1.5 on my mandolin for these red onions. You want them thin but not paper thin so that they might fall apart in the vinegar.
Serve these onions with tacos, nachos, fajitas, enchiladas, quesadillas, grain bowls, salads, burgers, sliders, wraps and more!

Nutrition

Serving: 1serving | Calories: 7kcal | Carbohydrates: 1g | Sodium: 160mg | Sugar: 1g
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