There is a lady on our estate that does a food rescue service from local supermarkets of past it's sell by date food. I get most of my bread from her, think I've only bought two loaves this year.
Today she had some shitake mushrooms which i am unfamiliar with, so I had a quick Google which told me to fry them for 8 to 10 minutes. I did as it said but was quite disappointed, certainly would not spend good money on them!