Ingredients
1 medium red onion, thinly sliced (about 1 cup)
1/4 cup red wine vinegar or apple cider vinegar
1/2 tsp. sugar
Kosher salt
Preparation
Place onion slices in a medium bow. Pour vinegar and 1/2 cup warm water over onion. Stir in sugar and season with salt; let stand until slightly pickled, about 30 minutes. Drain. DO AHEAD Can be made 2 days ahead. Let cool slightly. Cover and refrigerate.
