Pickled Red Onion Recipe (Quick & Easy)
This pickled red onion recipe is one of the easiest and most popular ways to use homegrown onions. It softens strong flavours, adds colour and crunch to meals, and is perfect if you have a surplus of onions that won’t store long term.
⭐ Recommended Products — 🧅 Onions (Seeds, Sets & Storage Essentials)
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Onions are a staple crop for gardens and allotments — easy to grow and brilliant for long-term storage when done right.
• Onion Sets (Spring & Autumn Planting)
Small starter bulbs that are quick and reliable to grow — ideal for beginners and perfect for strong, consistent harvests.
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• Onion Seeds (Wide Variety Selection)
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Specially formulated fertiliser to support healthy leaf growth and strong bulb development — apply during the growing season for better yields.
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• Onion Storage Bags (Breathable Mesh Sacks)
Allows airflow while storing harvested onions — helps prevent rot and keeps bulbs fresh for months.
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• Onion Drying Rack / Harvest Storage Crate
Perfect for curing onions after lifting — improves longevity and ensures proper drying before storage.
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Whether your onions are mild or peppery, pickling transforms them into a versatile kitchen staple.
Why Pickle Red Onions?
Pickling red onions:
- Reduces sharp, peppery flavour
- Extends shelf life
- Preserves colour and crunch
- Uses onions that won’t store well
It’s also a great solution if your onions have bolted or grown smaller than expected.
For growing advice from planting to harvest, see ONION SETS UK: THE COMPLETE GUIDE TO PLANTING, GROWING & HARVESTING ONIONS.
Best Onions to Use for Pickling
Red onions are ideal because:
- They soften quickly
- Their colour deepens when pickled
- They balance sweetness and acidity well
Strong onions work particularly well. If your onions taste sharp, read WHY DO SOME ONIONS TASTE PEPPERY to understand why.
Ingredients (UK-Friendly)
You’ll need:
- 2 medium red onions
- 200 ml white wine vinegar or cider vinegar
- 1 tablespoon sugar
- 1 teaspoon salt
- Optional: peppercorns, mustard seeds, bay leaf
How to Make Pickled Red Onions
- Peel and thinly slice the red onions
- Place onions into a clean heatproof jar
- Heat the vinegar, sugar, and salt gently until dissolved
- Pour the hot liquid over the onions
- Ensure onions are fully submerged
- Leave to cool, then seal
Onions will be ready to eat within 30 minutes, but flavour improves after a few hours.
How Long Do Pickled Red Onions Last?
When stored in the fridge:
- Best used within 2–3 weeks
- Keep sealed and submerged in vinegar
Always use clean utensils to extend shelf life.
Can You Use Pickled Onions From Bolted Plants?
Yes — and it’s one of the best uses for them.
Bolted onions:
- Don’t store well
- Often taste stronger
- Are perfect for pickling
If bolting has been an issue, see WHY ONIONS BOLT AND HOW TO STOP IT for prevention tips next season.
How Pickling Reduces Onion Sharpness
Pickling works by:
- Breaking down sulphur compounds
- Balancing flavour with acidity and sugar
- Softening the onion texture
If you prefer milder onions overall, you may also want to review BEST ONION VARIETIES FOR UK GARDENS.
What to Serve Pickled Red Onions With
Pickled red onions are great with:
- Salads
- Burgers and sandwiches
- Cheese boards
- Tacos and wraps
- Roasted vegetables
They’re also a brilliant way to use onions that won’t keep long term.
If you have a large harvest, see WHAT TO DO WITH TOO MANY ONIONS for more ideas.
Can You Pickle Other Types of Onions?
Yes — white and brown onions can also be pickled, but:
- Red onions give the best colour
- Stronger onions produce bolder flavour
Always slice thinly for best results.
Summary: Pickled Red Onion Recipe
- Perfect for surplus onions
- Softens strong, peppery flavour
- Ready in under an hour
- Keeps for weeks in the fridge
- Ideal for onions that won’t store
For guidance on harvesting and storage before pickling, see WHEN ARE ONIONS READY TO HARVEST IN THE UK and HOW TO STORE ONIONS LONG TERM.
For everything else onion-related, return to ONION SETS UK: THE COMPLETE GUIDE TO PLANTING, GROWING & HARVESTING ONIONS.
Related Onion Growing Guides
- WHEN TO PLANT ONION SETS IN THE UK
- BEST ONION VARIETIES FOR UK GARDENS
- WHY ONIONS BOLT AND HOW TO STOP IT
- HOW TO GROW ONIONS IN CONTAINERS
- PICKLED RED ONION RECIPE