Peel the red onions and slice them thinly.
In a small saucepan, combine the white wine vinegar, water, honey, and salt. Heat over medium heat until the honey and salt are completely dissolved.
Peel the garlic clove and cut it in half. Gently crush the black peppercorns with the flat side of a knife to release their flavor.
In a clean, sealable jar, layer the red onion slices, then add the garlic and crushed peppercorns.
Pour the hot pickling liquid over the onions, gently pressing down with a spoon to ensure they are fully submerged.
Let the jar cool to room temperature for about 30 minutes, then seal and refrigerate for at least 24 hours to allow the flavors to meld.
Use the pickled red onions on burgers, tacos, salads, or as a side dish for meats. They will keep in the refrigerator for 2-3 weeks.
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