He found this mushroom in their backyard one day while searching for the cat, Umbra. At first glance he thought that the white blob was a discarded grocery bag, but when he got closer he realized that it was a huge fungus. It looked like a head and had a gaping mouth that immediately reminded him of Audrey II from "Little Shop Of Horrors".
It just so happens that Rick had friends that had published a book called Start Mushrooming by Stan Tekiela and Karen Shanberg, and they were able to identify this colossus as an edible puffball (Calvatia gigantea). This puffball was in it's younger state. When they mature they become swollen with spores. All the time just sitting there hoping that something will come across it and burst it. This sends the spores out for future procreation. At this point in the life of the puffball it is poisonous. Ewww, very alien like. Does it have acid for blood? God, isn't nature just great? Better than most science fiction!
So, upon the harvesting of this alien looking thing, they had already decided what they were going to make. They found a mushroom soup recipe, and then were going to cut hanks of it and make "steaks."
He also noted that it was rather hefty and had substantial weight. I don't think they they ever got the official weight or measurement of it. It was definitely bigger than his head, and for all of us who know Matt, that's huge! (Just teasing buddy! You know I love ya!)
How interesting. I am just amazed that they just happened to have access to this book, took the chance to pluck it from it's home, chop it up and eat it! I don't think that I would be that adventurous. I mean, I have eaten a lot of weird things in my life, but this would be for me like playing Russian Roulette.
"Yo dude...look what I found! We can feast for months!"