Pickled Red Onions (Ready in 30 Minutes)

What Makes This Recipe Work

A near-equal vinegar-to-water brine is acidic enough to pickle the onions quickly while staying mellow enough to eat straight from the jar. Keeping the onion slices thin and letting them sit in the hot brine means they soften and color evenly, and the optional spices round out the sharpness without hiding the onion.

Ingredients for Pickled Red Onions (Ready in 30 Minutes)

• 1 large red onion (about 12 oz / 340 g), peeled and sliced 1/8 inch thick
• 3/4 cup (180 ml) distilled white vinegar, 5% acidity
• 3/4 cup (180 ml) water
• 1 tbsp (12 g) granulated sugar
• 1 1/2 tsp (9 g) fine sea salt
• 1 small garlic clove, smashed (optional)
• 1/2 tsp whole black peppercorns (optional)
• 1/4 tsp dried oregano (optional)
• 1 small bay leaf (optional)

How to Make Pickled Red Onions (Ready in 30 Minutes)

1. Pack the sliced onion into a clean 1-pint jar, tucking the garlic, peppercorns, oregano, and bay leaf between the slices if using, and press the onion down so it sits about 1 inch below the rim.
2. In a small saucepan, combine the vinegar, water, sugar, and salt over medium heat, stirring just until the sugar and salt dissolve, about 2 to 3 minutes. Do not let it boil hard, or the brine will evaporate and concentrate.
3. Pour the hot brine over the onions to cover them completely, leaving about 1/2 inch of headspace at the top of the jar.
4. Press the onions down with a spoon or weigh them with a small clean glass so they stay under the brine, then tap the jar on the counter to release trapped air bubbles.
5. Let the jar cool to room temperature, about 30 minutes. The onions will turn a bright, even pink within the first half hour as they absorb the brine.
6. Cap the jar and refrigerate at least 1 hour for a light pickle, or overnight for the fullest flavor, before serving.
7. Taste after 24 hours; the onions should be crisp and tangy with no raw bite. Serve with a fork or clean spoon so the brine stays clear.

Tips for the Best Pickled Red Onions (Ready in 30 Minutes)

• Slice the onion as thin and even as you can; thick chunks take much longer to soften and color.
• Keep the vinegar-to-water ratio close to equal for a balanced quick pickle, and use a vinegar labeled 5% acidity.
• If you add extra onion, top it up with equal parts vinegar and water rather than stretching the same brine.

Variations and Substitutions

• Add a sliced jalapeño or a pinch of red pepper flakes for heat, or swap in apple cider vinegar for a slightly sweeter tang.
• For a mixed jar, combine these onions with the brined beets in the Pickled Beets recipe or the crisp beans in the Pickled Green Beans recipe.
• Use the same brine ratios in the Refrigerator Pickles recipe if you want to move from onions to cucumbers.

How to Store and Reheat

• Store pickled red onions in the refrigerator and use them within 3 to 4 weeks; they keep best fully submerged in the brine.
• These are a refrigerator pickle, not a shelf-stable product, so do not leave the jar at room temperature.

Pickled Red Onions (Ready in 30 Minutes) FAQ