Peel the red onions and slice them thinly.
Finely chop the fresh chili. Peel and halve the garlic clove.
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.
Lightly crush the whole black peppercorns with the flat side of a knife to release their flavor.
In a clean, sealable jar, layer the red onion slices. Add the garlic, crushed peppercorns, chopped chili, and chili flakes.
Pour the hot pickling liquid over the onions, pressing down gently 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 spicy pickled red onions as a condiment for burgers, tacos, salads, or alongside grilled meats. They will keep in the refrigerator for 2-3 weeks.
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