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Well, I didn't get a confirming reply, but he said if it is what we think it is, I should parboil it to soften the tissue.
So I sliced that smaller one up, parboiled it, and fried it in little olive oil, with salt and pepper. Tasted breddy gud. It was still a little chewy. If I get the shits tomorrow I won't I'm confident in my identification I know what to blame.