Onions
Store onions in a dry area where the temperature stays between 30ºF and 50ºF, and they’ll keep for up to a year. If you don’t have a place like that, keeping them in mesh bags (like the kind used to package grocery-store onions) and storing them in a dark cabinet will let them last for up to a month, and perhaps longer.
Eat This: Caramelized Onion and Sweet Potato Soup