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To freeze onions, start by peeling and chopping the onions to your preferred size. Be sure to keep the pieces larger than 1/2 an inch to prevent ice from forming on them in the freezer. Then, place the onions in a large, resealable freezer bag in a single, flat layer. Press out all the air before you seal it, and mark the bag with the date you froze them. Place the bag in the freezer and use the onions within 6 months.
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Plant & Gardening Specialist
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Updated: March 3, 2023