^ 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.
Cut onion can be stored 7-10 days in a sealed container in the refrigerator. I've not experimented specifically with glass or plastic, but I can understand how glass would be better. I'll have to give that a try. Sharp knives are key, that was a spot on tip!