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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.
From the best way to store fresh herbs like basil and cilantro, to how long a cut onion will last in the fridge, weâve compiled a list of common leftovers and how long you can safely keep them. Follow the guidelines closely, and as a general rule, if youâre worried about something itâs safer to throw it out then risk getting a foodborne illness.