Bulb onions store well in a cool, dry place. Freezing is usually not recommended since onions change flavor when frozen.
Preparation: Chose mature bulbs and clean as for eating. Water blanch for 3 to 7 minutes or until center is heated. Cool promptly, drain and package, leaving 1/2-inch headspace.
Seal, label and freeze. These are suitable for cooking only.
Source: MSU Extension
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