These onions are a great addition to salads, but they're also wonderful on burgers or hot dogs or with grilled poultry or meats.
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In a medium bowl, combine the vinegar and cold water with the sugar and salt. Stir to dissolve the sugar and salt.
Put the onion slices in a colander and pour the boiling water over them. Rinse under cool water and drain. Add the onion to the vinegar brine, cover with plastic wrap and refrigerate until chilled.