Quick Pickled Red Onion
Quick pickled red onions are one of those small kitchen tricks that make a big difference. They add a bright, tangy pop and just the right amount of crunch to almost any dish. With a simple hot vinegar brine poured over thinly sliced onions, the sharp raw edge mellows out, leaving you with onions that are lightly softened, refreshing, and perfectly balanced.
How to Adjust for Acidity
Not all vinegars are created equal! This recipe is balanced for 5% acidity (the standard for most Apple Cider and White Distilled vinegars in the US and UK).
However, in many parts of Europe, 10% spirit vinegar (Essigessenz or Ättika) is the norm. Because this recipe uses less vinegar to compensate for the lack of sugar, getting the acidity right is essential for flavor.
The Dilution Guide
If your vinegar is stronger than 5%, you must dilute it with more water to prevent the onions from becoming overly sharp or harsh.
| Vinegar Strength | How to Adjust | Simple Ratio Example |
|---|---|---|
| 5% Acidity | Use as written in the recipe. | 100ml Vinegar + 100ml Water |
| 10% Acidity (EU Standard) | Cut the vinegar in half and replace that volume with water. | 50ml Vinegar + 150ml Water |
| 6% - 7% Acidity | Add a generous splash of extra water. | 80ml Vinegar + 120ml Water |
How to Store Pickled Red Onions
Properly stored, these refrigerator pickled red onions stay crisp, tangy, and ready to use whenever you need them.
- Store the onions in a clean glass jar with a tight-fitting lid.
- Keep the onions completely submerged in the pickling brine to maintain the best texture and flavor.
- Always refrigerate after they have cooled to room temperature.
- For the best flavor and crunch, enjoy them within the first week, though they'll typically keep well for 2–3 weeks in the refrigerator.
- Always use a clean fork or spoon when serving to help them stay fresh longer.
- This recipe is for refrigerator pickled onions only. It is not shelf-stable and is not intended for canning.