Hokkaido and the rest of Japan has a culture of foraging and consuming the edible, not typically commercially-available, wild plants (known as sansai) that grow lushly all over the island. There’s an abundance of food, if you know where to look and can discern between various plants.
Before I go any further, though, I need to warn you- I’m not an expert. Every time I’ve picked and eaten any of these plants, it’s been with someone who has much more experience than me in finding and identifying them, and I’ve been cautioned and shown lookalike (inedible and sometimes poisonous) plants many times. Sometimes, parts of a plant can be eaten while other parts can’t and are dangerous. So be careful, and go with someone experienced if this piques your interest!
This especially applies with mushrooms, which I am going to talk about today! Because of all the rain that occurs in late summer and early fall, a lot have cropped up, and so I’ve eaten a lot of rakuyo (落葉) mushrooms.
I would never have though to eat rakuyo if they hadn’t been given to me by my tea ceremony teacher. They’re a muddy brown color, and the bottom of the mushroom cap is spongy, which usually would indicate something that I wouldn’t want to eat. They also tend to look… well… kind of slimy. But don’t let that turn you off from trying them if they’re ever offered to you!
They go bad quickly, so you have to find them shortly after they sprout. I’ve never seen them offered for sale, and that could be why- just not a long enough shelf life.
I ate rakuyo quite a few different ways. My favorite was soaked in sweet vinegar, but people also eat them in miso soup, with daikon oroshi, and just generally in substitute for other mushrooms in recipes. They are… slimy… but they have a really good taste, assuming you can make it to your mouth and not drop it from your chopsticks onto the table. Give it a try if you have the chance!