Peel the onions and chop or slice according to your preferences.
Package in recipe-size portions in ziptop freezer bags or freezer-friendly containers.
Alternatively, to freeze them loose, place them on a lined sheet pan and freeze until firm. Once solid, transfer the frozen onions to packaging and return to the freezer.
To use: add to recipe from frozen.
Frozen onions will be safe indefinitely if kept at below zero degrees, but after ten months, their quality will start to diminish. Since home freezers are not as consistent and reliable as commercial freezers, try to use your frozen onions within a couple months.Use onions in sautés, stir-fries, soups, chilis, and stews. They are also good in sauces and gravies, and go well with roast meat dishes.