They add an irresistible crunch and crisp, tangy flavor to anything you pair them with.
Carefully slice your red onion. Then, add them to a jar or container with a lid.
In the same jar, add in water, apple cider vinegar, sugar, and salt.
Secure the lid onto your container and shake well to mix.
Store in the fridge until your pickled onions are bright pink and tender. This may take 30 minutes to overnight.