With a crisp juicy crunch and powerful burst of flavor in every bite, onions bring a lot to the table. From a nutrition standpoint alone, onions provide a healthy dose of vitamins B and C in addition to dietary fiber and protein with a low amount of calories. From garnishes to added flavor, freshly sliced onions can also help to lower blood pressure. Once an onion has been sliced, though, a virtual timer has begun to mark its inevitable expiration. Proper storage can ensure that it remains as fresh as possible to the very last bite.
Line a baking sheet with wax or parchment paper to cover the entire surface.
Place the onion slices onto the paper so that none of them are touching.
Set the baking sheet in the freezer, making sure it remains level so that onions do not slide off or bump into each other.
Allow the onions to freeze for 15 to 20 minutes. This helps to keep them from sticking to each other when they are stored long term.
Take the baking sheet out of the freezer and transfer the onion slices into freezer bags.
Mark the date on the bag with a pen or marker and place it into the freezer.