My neighbor gave me a few Yacon rhizomes a couple of years ago, and now I have a Yacon forest. This Peruvian vegetable looks a lot like a sunflower, with long stalks and heavy green leaves, but the flowers are smaller. Underground, it grows huge tubers.
I use them in salads and fruit salads. I’m sure I could use them like water chestnuts in stir fry, too. My only problem is a surplus of Yacon. Fortunately, I can leave them in the ground awhile and harvest them gradually.