Beer--I suppose that one could can them, like the canned cultivated agaricus you buy at the grocery. I would guess one should use a pressure canner to safely do that. We have sliced and dried them to use in soups and stews, which works pretty good for that purpose,and have tried freezing (yuck!). I bet pickled a. campetris mushrooms are good--sorta like marinated mushrooms?

Janie