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How to Make Spicy Pickled Onions

By Micah Ewing on February 3, 2025

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Spicy pickled onions are the perfect topping to add a pop of beautiful color as well as a crisp hot and tangy topping for salads, sandwiches, rice bowls, and much more! In this post you will learn how to pickle and store these spicy onions as well as some of the best ways to serve them.

Spicy pickled onions in a vintage mason jar

Ingredients

Red Onion Sliced thinly

Apple Cider Vinegar can be substituted for unseasoned rice vinegar or white vinegar

Water

Sugar

Kosher Salt: or sea salt

Garlic Cloves peeled

Serrano Peppers Sliced

Ingredients for spicy pickled onions laid out on a wooden board

Tools You May Need

Pint-sized Mason Jar with Lid

Canning Funnel (optional)

Knife

Cutting Board

Small Pot

Spicy Pickled Onion Directions

Sliced red onion next to a vintage mason jar

STEP 1: Chop the ends off of the onion. Peel and thinly slice it, then place it into a pint sized mason jar.

brine for spicy pickled onions in a small pot

STEP 2: Add the apple cider vinegar, water, sugar, and salt to a small pan, and bring it all to a boil over medium-high heat, stirring occasionally.

Sliced serrano pepper and garlic cloves on a wooden cutting board by a knife

STEP 3: Once the brine is boiling and the sugar and salt have dissolved. Remove the pan from the heat and cool for about five minutes. While the brine is cooling, slice the serrano peppers and peel two cloves of garlic.

Mason jar filled with pickled spicy onion ingredients by a canning funnel

STEP 4: Add the peppers and garlic to the mason jar then carefully pour the brine over the onions using a canning funnel if you have one. Be sure to fully cover the vegetables. Set aside to cool.

spicy pickled onions about to pickle in the fridge

STEP 5: Once the onions have cooled completely, place your lid on the jar and refrigerate for at least 30 minutes or ideally around two or three hours before eating.

Tips

  • Make sure to not skip cooling the brine before pouring it over the onions. A boiling hot brine can damage jars at the sudden heat change.
  • Though these are ready in thirty minutes, the longer they sit the more pickled they will taste. They are great if you can leave them pickling for several hours or even overnight.
  • You don’t need to boil the brine long at all. Once everything is dissolved and it’s good to go. This may even occur before it boils at all, but you do need it hot to speed up the pickling.

Variations

Non-Spicy

To make regular pickled onions, simply omit the peppers.

Less Spicy

Substitute the serrano peppers for jalapeños. Jalapeños vary in their spice level, so just be aware that you could also get some pretty hot peppers this way. Test them before you add them if this is a concern to you.

Less “pickle-y”

To make the pickle flavor a bit more mild, substitute the apple cider vinegar for unseasoned rice vinegar. This has a much more mild taste and a bit less acidity. Keep in mind that the faster you eat these pickled onions, the less pickled they will taste as well.

How to Store

Refrigerate these spicy pickled onions in their jar. They will last for about two or three weeks.

Spicy pickled onions on top of beef ribs

What to serve with Spicy Pickled Onions?

Mediterranean Wraps (our favorite way to serve them)

Tacos

Rice Bowls

Nachos

Sandwiches

Salads

Sausages or Hot Dogs

Pin it for later!

two pictures showing how to make spicy pickled onions with a title

If you tried these spicy pickled onions with a dish other than those listed above, we would love new ideas! Let us know how it was in the comments below!

jar of spicy pickled onions
Print Recipe

Spicy Pickled Onions

Spicy pickled onions are the perfect topping to add a pop of beautiful color as well as a crisp hot and tangy topping for salads, sandwiches, rice bowls, and much more!
Prep Time10 minutes mins
Pickling Time30 minutes mins
Total Time40 minutes mins
Course: Condiment
Cuisine: American
Servings: 1 Pint Jar

Ingredients

  • 1 Red Onion sliced thinly
  • 1 Serrano Pepper sliced
  • 2 Garlic Cloves
  • 3/4 Cup Apple Cider Vinegar
  • 3/4 Cup Water
  • 1 Tbsp Sugar
  • 2 tsp Kosher Salt or sea salt

Instructions

  • Peel and thinly slice the onion, then place it into a pint sized mason jar with the sliced pepper and garlic cloves.
  • Add the apple cider vinegar, water, sugar, and salt to a small pan, and bring it to a boil over medium-high heat, stirring occasionally.
  • Once the brine is boiling and the sugar and salt have dissolved. Remove pan from heat and cool for five minutes.
  • Pour the brine over the onions. Set aside to cool.
  • Once the onions have cooled completely, place lid on the jar and refrigerate for at least 30 minutes before eating.

Notes

    • Though the onions are ready in thirty minutes, the longer they sit the more pickled they will taste. It’s best if you can leave them pickling for several hours before eating if not overnight.
    • To make regular, non-spicy pickled onions, omit the serrano pepper.

Want more recipes? See what else we have waiting for you HERE!

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Hi! I’m Micah, housewife to Samuel, and an aspiring homesteader living in the city. Follow along for recipes and urban homesteading tutorials every week. Read more about us here.

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