- In a small pot, combine the apple cider vinegar, white vinegar, honey or maple syrup and heat until hot, but not simmering or boiling, and the sweetener has completely dissolved.
- Next, add the sliced red onion to the vinegar mixture. Press the onions down with the back of a spoon until they are completely submerged in the vinegar mixture. Let the onions sit until they begin to turn a bright pink, purple color.
- Remove the pot of onions from the heat and let them come to a complete cool. Once the onions are room temperature, transfer them to a storage container and store in the fridge.
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