Ha haa. Glad to jump-start a new project. Though don't take any of MY word on what is truly edible. Stick to people like @haphazard-hstead and other's for those things. I've heard some cacti are edible, at least some of the pads. And some look like that. But I'm only expert in a few things, like feeding the cat, making ends meet or riding my bike in a straight line and such. So good luck in the quest ( :
PS. check out the camel eating a cactus on Youtube/google. It's AMAZING. And hurts just to watch. But guess they do. Special mouth parts and all that. Yeowtch.