This is one of the oddest vegetables. Like the potato, nagaimo is a tuber, but when you cut into it the texture is bizarrely slimy. But don't be scared, because it's low calorie and surprisingly refreshing. Usually found at Japanese grocery stores, I believe you can also find it at Ranch 99 or Berkeley Bowl. It's usually wrapped in plastic wrap with something that looks like sawdust (rice bran, maybe?) on the ends to keep it from seeping.
Peel as much as you're going to eat, and then grate it with a box grater.
Serve it over hot rice with a big squeeze of lemon juice and soy sauce. Re-wrap the unused portion of nagaimo and store it in the refrigerator.
I'm sure there are other ways to eat this, but this is the way I was shown. I started a nagaimo board on pinterest, but who knows when I'll get around to trying it other ways. Leave me a comment to tell me how you eat this if you've had it before. I'd love to know.
I love trying new foods, cooking, and gardening. I hope to share these experiences on this site. Thanks for taking a look!