Combine vinegar, water, sugar, salt, bay leaf, and black peppercorns in a sauce pot and bring to a boil.
Once boiling, carefully add the onions, simmer on low for five minutes or until the onions begin to soften.
Allow onions to cool then transfer onions and liquid to a container to hold them and refrigerate. They will be ready to use once cooled.
Slow Method
Combine 1 cup water and salt in a bowl and whisk together, add the onions, let stand for one hour
Combine vinegar, remaining ¾ cup water, sugar, bay leaf, and black peppercorns in a sauce pot and bring to a boil, cool immediately.
Once the vinegar brine has cooled, drain the onions and give them a quick rinse and place into a jar or container to hold them
Pour the cooled brine over the top and store in the refrigerator. Ready to use after three days.
Video
Notes
Storage: Store the pickled onions in an air tight glass container in the fridge. The quick method will last up to one month and the slow method will last up to two months.