I read a book recently titled "The Evolution Diet". It was about how we have changed our eating habits, and that we need to get back to eating like our early ancestors did.
Early man ate by foraging. No supermarkets back then.
I've always been a forager--nuts and berries and fruits being my prime targets. I have a freezer full of walnuts, blackberries, apple sauce, etc.
When playing golf a couple of days ago, I came across a large puffball mushroom. I picked it, took it home, sliced it up, and sauteed it in a cast iron skillet. Before eating it, I googled it, just to confirm it was the right kind (there's one kind of puffball that is deadly!). Safe! Whew! And delicious.
I was amazed at how much information there was on puffballs, recipes included. There were more mushrooms on the golf course, so I'm taking a sack to gather them up. I think they'll freeze after cooking. Yum.