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Thinly slice the onion and place it into a bowl.
Pour boiling water over the onions making sure they are covered. Soak the onions for about 10 minutes.
Drain the onions and pat them with a paper towel.
Add 1/4 cup of red wine vinegar to the onions and mix them well. Let the onions marinate for 5 to 10 minutes, making sure to stir them a few times.
Drain the vinegar leaving about 1 teaspoon in the bowl.
Add the rest of the ingredients and stir to combine. Place the onions in the fridge for about 30 minutes before serving.