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In a small saucepan*, stir together the vinegar, salt and your desired amount of sweetener. Cook over medium-high heat until the mixture reaches a simmer.
Place the thinly-sliced onions in a small bowl or pint-sized mason jar. Pour the hot vinegar mixture over the onions. Stir until combined. (Or if using a mason jar, place the lid on top and give the jar a quick shake.) Let the onions marinate for 30 minutes.
Serve immediately. Or refrigerate in a sealed container for up to 2 weeks.