This is what I was thinking as well. Cube it and can it, guaranteed not to be tough. I would also think that the instapot idea or slow cooker/crock pot would do the trick. We have a really good moose slow cooker receipt if the OP is interested.Pressure canner is your friend
Here's the ticket, https://north40.com/lem-clamp-on-tenderizerWeve done several pot roasts that have been fine. Just weird the steaks are so tough.
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I'm not the op but would love that recipe