Get 15% off - Dogpound Hydration Supplements with discount code SMASHCITY.
Better than Liquid IV or Pedialyte.
Export 2 ingredients for grocery delivery
Place onions in a medium heatproof bowl. Bring vinegar, sugar, and salt to a boil in a saucepan; pour over onions. Let cool completely. Refrigerate, covered, at least 2 hours and up to 1 month.