Why I Keep a Jar of Quick Pickled Onions in My Fridge
I never used to think much about pickled onions until a friend brought tacos to a potluck and handed me a forkful topped with something tangy and pink. That was my first taste of quick pickled onions, and I honestly couldn’t believe something so simple could change a dish that much. Now I almost always have a jar in my fridge, and it’s the first thing I reach for when a meal feels flat. These quick pickled onions are made with just 2 large red onions and a simple brine, so prep takes about 5 minutes. No boiling water bath, no special equipment, just a clean jar and a few pantry staples.
The trick is they work on everything. Tacos, sure, but also salads, sandwiches, grain bowls, eggs, even grilled cheese. The acidity cuts through richness and adds a bright pop of color. And because they’re quick – not fermented – you can eat them after 30 minutes, though they get better after a few hours. I’ve made them for dinner parties and for solo weeknight meals, and they never disappoint.
The Simple Brine That Makes Them Work
The brine is the heart of any good quick pickle, and I’ve tested a few versions before landing on one I love. My go-to ratio is ½ cup water, ½ cup apple cider vinegar, 1 tablespoon sugar, and 1 teaspoon salt. That’s enough for two medium red onions sliced thinly. I heat the liquid just until the sugar and salt dissolve – you can do it in a small saucepan or even in the microwave.
Why apple cider vinegar? It’s milder than white vinegar and adds a slight fruity note that pairs well with onions. If you only have white vinegar, use it but add an extra teaspoon of sugar to soften the sharpness. Rice vinegar also works if you want a subtler tang. The brine should be warm when you pour it over the onions – not boiling, just hot enough to soften them slightly so they pickle faster.
I’ve tried adding garlic cloves, peppercorns, and even a bay leaf, but honestly, the simplest version is the one I make most often. Plain brine lets the onion’s natural sweetness come through. If you want heat, throw in a dried chili or some red pepper flakes. But don’t overcomplicate it – the magic comes from the vinegar and time.
How to Slice Red Onions for Pickling
How you slice the onions matters more than you’d think. For quick pickled onions, you want thin, even slices so the brine penetrates quickly. I use a mandoline set to about ⅛ inch thick, but a sharp knife works just fine. Cut the onion in half from root to stem, peel it, then slice crosswise into half-moons. The root end holds the layers together, which makes slicing easier.
If you slice too thick, the onions stay crunchy and take longer to pickle. Too thin and they turn almost mushy after a day in the fridge. That half-moon shape is also great for piling onto sandwiches or tacos. I once tried slicing them into rings, but they fell apart in the jar. Half-moons hold up better and are easier to fish out with a fork.
One tip: soak the sliced onions in cold water for 10 minutes before brining. This removes some of the sharp sulfur compounds and makes them milder. Just drain them well after soaking. I skip this step if I want a stronger onion bite, but for general use, the quick soak is worth those extra minutes.
A Few Tips for the Best Homemade Pickled Onions
Over the years I’ve learned a few things that make these quick pickled onions turn out consistently great. Here’s what actually worked for me:
- Use a glass jar with a tight lid. Mason jars are perfect. Plastic containers can hold smells and stain. A 16-ounce jar fits two medium onions perfectly.
- Pack the onions loosely. Don’t cram them in. You need space for the brine to flow around every slice. Leave about ½ inch of headroom at the top.
- Let them cool before refrigerating. Hot brine on warm onions in a sealed jar can create pressure. I let the jar sit on the counter for about 20 minutes, then pop the lid slightly to release steam before screwing it shut and putting it in the fridge.
- Don’t skip the sugar. Even if you’re cutting back on sugar, that small amount balances the vinegar’s acidity. You won’t taste sweetness, but the onions will taste more rounded.
- Use red onions for the color. White or yellow onions work taste-wise, but they turn an unappetizing beige. Red onions turn
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