^ âeucatastropheâ (US) / âeucatastropheâ (UK) in Oxford Dictionaries, Oxford University Press.
For cooked onions, you can find one answer here: http://www.stilltasty.com/fooditems/index/17825. 1  3-5 days in the refrigerator. 2  refrigerate withing 2 hours of cooking. 3  refrigerate in covered container or wrap tightly with heavy-duty aluminum foil or plastic wrap.
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