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I did the sauté method in butter and garlic salt pepper . The froze them.I saved all of the juices when cooking and froze too.Used as a broth for mushroom soup. Turned out well.
I feel that if you do a quick saute, yank them from the heat, cool them quick, and then thaw later and cook quick with your steak, you end up with an acceptable firmness level. I agree overly soggy or overcooked shrooms get a bit gaggy....