Large mushrooms should be sliced and sauteed in butter before freezing.  They don't need to be blanched first.  Button mushrooms should be placed on a cookie sheet and frozen uncovered.  Once frozen, place in containers suitable for freezing.  For larger mushrooms, after cooking place in suitable containers with the liquid you cooked them in. I read a recipe for beef that says to cook in the oven at 175 F for 8 hours, is this safe? No.  When cooking beef roasts, the oven temperature should be no lower than 250F (120C).  To ensure the food is cooked to a safe temperature, use a food thermometer.  Foods cooked at too low a temperature for a long period of time may allow dangerous bacteria to grow. Hi. I bought some fresh pasta sauce,without meat,from the store at the beginning of Feb. I got it home and froze it straight away. I defrosted it on Friday (8th Feb) in the refrigerator. It is unopened and the use-by date is only the 22nd Feb,so it's not out of date yet. Is it safe? It's been in the fridge since last Friday,so 6 days ,but as i say,is unopened and still within it's Use By date. Just worried freezing it might have made it dangerous to eat. Thanks Just the opposite.  Once you freeze food, the best before date is no longer applicable.  Freezing does not destroy bacteria, but it does stop its growth.  You may still eat the sauce.  Make sure to heat it