Freezer "burn" is caused by air getting into freezer containers. Unless you vacuum seal, there will be air in any container. Any small air space will cause freezer "burn". The longer the item is kept in the freezer, the more freezer "burn" there will be.
There are two ways to minimize freezer "burn" in any type of container. The idea is to cover the surface of the frozen food.
Before freezing completely cover the top of the food with plastic wrap, pressing the wrap into the top, smooth out top to eliminate any air. If it is a liquid such as soup, press plastic wrap into the liquid to cover. Cover with tight lid.
Or freeze the contents, this usually takes 12-24 hours. Remove from freezer and crumple plastic wrap and completely cover the frozen top. Cover with a tight lid.
Using plastic wrap as a cover will prevent air from coming in contact with the frozen food. If the lid is not tight enough, cover the top with more plastic wrap, this will tighten the seal.
By mkymlp from NE PA
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