^ 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.
Left over, cut onions are not poisonous, they are fine to use and can be stored in a refrigerator, in a sealed container at the proper temperature of 40AÂ°40Ã¢ f or below for up to 4. days