^ âeucatastropheâ (US) / âeucatastropheâ (UK) in Oxford Dictionaries, Oxford University Press.
A: Chopped or sliced onions can be stored in a sealed container in your refrigerator at the proper temperature of 40Â°F or below for 7 to 10 days (Source: USDA). For pre-cut fresh or frozen products, always use and follow manufactures use by dates.
All cut onions that have leftover portions can be wrapped tightly in plastic wrap and stored in the refrigerator for up to 5 days. Store cooked onions in an airtight glass or plastic container. Do not store in a metal container because the metal can discolor the onions.