We have several available in the stores and the name sweet potato (those are least expensive) and yam are interchangeable. The ones called sweet potato yams come in garnet, purple, and white varieties it's all rather confusing!
I am also hearing this variety for the first time and hence it is really confusing, and I don't know if it's even called a sweet potato or if it's a different fruit. I like sweet potatoes, and among the varieties available here, at least now I know which one is the sweetest. And what I meant about the price is that it is comparatively expensive but even the most expensive ones cost less than half a dollar per KG. 😋
