Peel onions ensuring to set aside the very driest, paper-like skin layer
Slice onions into circles
Remove any broken slices or small circles
Place onion slices and skins into jar
Add water, vinegar, salt and sugar to pot and heat/stir until simmering and fully dissolved
Pour liquid over onions until fully submerged
Let cool, seal lid and refrigerate
Keep them for up to 2 weeks!
