"Pickled onions are perfect for pulled pork. Of course, you can use them as an addition to many other dishes. ..."
INGREDIENTS
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1 cup fresh lime juice
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1/2 cup distilled white vinegar
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1 tablespoon sugar
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2 teaspoons kosher salt
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2 large red onions
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2 teaspoons finely chopped oregano leaves
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2 whole Serrano chilies or jalapeño chilies (, slit down the center (optional))