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Export 2 ingredients for grocery delivery
Step 1
Place onions in large heatproof jar.
Step 2
Heat vinegar, sugar, salt, and 1/3 cup water in small saucepan over medium-high heat, whisking occasionally, until sugar and salt are dissolved, about 3 minutes.
Step 3
Pour pickling liquid over onions (onions should be submerged). Let cool.
Step 4
DO AHEAD: Onions can be pickled 2 weeks ahead. Cover and chill. Drain before using.