Place the sliced onion into a clean, heatproof jar.
Combine water, apple cider vinegar, sugar, and salt in a small saucepan and bring to a gentle simmer over medium heat, stirring until sugar and salt dissolve.
Carefully pour the hot brine over the onions, ensuring they are fully submerged.
Let the jar cool to room temperature before sealing with a lid and refrigerating.
Notes
Store the pickled onions in the refrigerator with a tight-fitting lid.Use within two weeks for optimal crispness and safety.
Nutrition
Serving: 50gCalories: 15kcalCarbohydrates: 3g
Keyword condiment, easy pickle, Pickled Red Onions, quick pickled onions, red onion pickle