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In a saucepan, combine vinegar, water, sugar, and salt. Heat gently and stir until sugar and salt dissolve.
Add garlic, peppercorns, mustard/cumin seeds, and dried herbs. Let the mixture cool slightly.
Place the sliced onions in a clean glass jar.
Pour the warm brine over the onions, making sure they are fully submerged.
Let cool to room temperature, then seal the jar and refrigerate.
The onions are ready after 1 hour but taste best after 24 hours.
Serving and Storage Tips:
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