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He bought them on the general theory of "this looks interesting" at Uwajimaya, the big Asian grocery store, yesterday. After a bit of googling around, he decided to roast them: peeled, cut into eighths, tossed with olive oil, salt, and pepper, and cooked them in the oven at 350 (180 C, gas mark 6) for 45 minutes.
They were tasty, but a little mealy, meaning that for roasting I think I prefer our usual orange sweet potatoes/yams*. Next time we'll probably boil and mash them, either with butter and maybe milk (like potatoes), or maybe with coconut milk as some web sources suggested.
* Root vegetable names are a hopeless tangle; go to different islands of the Caribbean and you get the same thing of one root having two or three or more Spanish names, and the same name meaning two or more kinds of roots.