Frozen foods for preservation, but freezing does not kill bacteria in these foods only halt its and so should the initiative to cook these foods such as meat, poultry, fish when melting snow that by not even active harmful bacteria in Food and lead to damage to make sure the demise of all the ice because ice takes up a large part of the heat of cooking, and this reduces the impact of the deadly bacteria.
The best ways to break the frozen foods is that she graduated from the freezer overnight and then placed in a bowl on the top shelf in the refrigerator and leave so on until the morning and you'll be ready to cook.
And should come out of the freezer the quantity to be cooked only and be used because all of the error re-icing each other again.