Add water, vinegar, sea salt, bay leaves, and sugar to a small pot and bring to a simmer. Allow to simmer for 5 minutes or until salt and sugar are completely dissolved
Remove from heat and allow to cool
While the brine is cooling thinly slice your red onion and slice garlic cloves
*Tip (use a mandolin slicer with the guard to protect your fingers or slice with a sharp knife. Once you have a thick piece remaining chop that portion up.
Add sliced red onion, and garlic cloves between 2 small Mason jars or one large jar or glass bowl
Remove bay leaves and add one to each jar (if using 2 small jars)
Add cooled liquid and dried parsley and black pepper between two jars
Add a lid and store in the fridge until you're ready to enjoy them