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Place the red onions in a 1 liter (4 cup capacity) sterilized glass jar.
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In a small saucepan, heat the remaining ingredients until the sugar has dissolved then pour over the red onions, ensuring the onions are completely covered.
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Place the lid on the jar and allow to cool before placing in the fridge for at least 24 hours before serving.
These pickles will last for up to 1 month in the refrigerator.