Quick pickled onions add a bright, tangy topping to sandwiches, tacos and bowls. Make a small jar so you can use it while the slices still have a pleasant bite. The refrigerator is part of the method.
Pack thin onion slices into a clean heat-safe container, cover with a hot vinegar-and-water brine and refrigerate promptly. Let chill before serving and use clean utensils each time.
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Follow the steps and check them off as you go →Before you begin
This is not a canning formula. Keep the finished onions refrigerated and do not store the jar in a pantry. If using a mandoline, use its hand guard and follow safe handling instructions.
What you’ll need
- Knife and stable board
- Small saucepan
- Clean heat-safe jar
- Tongs or fork
Measure before you start
Ingredients
Base batch: About 1 pint
Ingredient amounts scale; oven temperatures and cooking times do not. Split a larger batch between pans when needed.
Use the base batch for your first attempt. Adjust seasoning to taste and check texture as you cook.
Let’s do this
Step by step
- 01
Slice the onion
Peel and cut thin even slices with a stable board and sharp knife. Place in a clean heat-safe container with room for the brine.
- 02
Heat the brine
Combine vinegar, water, sugar and salt in a small pan. Bring just to a simmer and stir until dissolved. Do not substitute an unknown-strength homemade vinegar.
- 03
Cover the slices
Pour carefully over the onion, avoiding thermal shock to a cold fragile jar. Press slices below the liquid with a clean utensil. Allow brief cooling while preparing refrigerator space.
- 04
Refrigerate promptly
Cover and refrigerate within 2 hours. Chill before serving; flavor develops over the next several hours. Keep the onions submerged and use clean utensils.
- 05
Use a small fresh batch
For this simple quick-pickle batch, plan to use within about a week. Discard if mold, unusual gas or other spoilage appears. Do not keep topping an old jar up with fresh onions.
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Keep quick pickling separate from canning
A sealed lid does not make these pantry-safe. Shelf-stable preservation requires an appropriately tested recipe, acidity and processing method, not just pouring hot liquid into a jar.
A quick final check
- Slice the onion
- Heat the brine
- Cover the slices
- Refrigerate promptly
- Use a small fresh batch
Common questions & sticking points
Can I reduce the vinegar a lot?
That changes the method. Keep the listed ratio for this small refrigerated batch or use another tested quick-pickle recipe.
Can I reuse the brine indefinitely?
No. Make fresh brine for a new batch rather than repeatedly adding onions to old liquid.
Sources & further reading Optional
References used to check this guide. Follow your product’s own safety instructions where its design differs.
Last source check: September 24, 2026
