Another way to store onions is to place them in boxes ... will retain its freshness for up to 14 days. However, peeled and chopped onion will last about 7 days in the refrigerator.

Melissa further advises: "Store your onions in a dry [spot] where ... and make the onions rot faster than you want them to." Peeled onions can last up to 10 days in the fridge when stored ...

Store onions in a cool, dry place ... To freeze onions, first peel and chop them to your desired size. Spread the chopped ...