^ 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.
Onions: Onions will last longer in the fridge, but not without cost. Like tomatoes, your onions will soften a bit if you put them in the fridge, and they won't be quite as crisp. Also, they'll make your other food smell like onions.nions: Onions will last longer in the fridge, but not without cost. Like tomatoes, your onions will soften a bit if you put them in the fridge, and they won't be quite as crisp. Also, they'll make your other food smell like onions.