Either taro or the one that I think is just called purple yam. Taro is popular in China and last year my friend got a Chinese cook to make some for a large Thanksgiving gathering and it was SO good.
Besides taro, might be ube? It's a root crop people hereabouts often use in sweet desserts.
Alternatively there actually are purple potatoes, the change in pigment owing to high concentrations of anthocyanin (googled it, idk about crops). Not sure if these'd be any sweeter than regular taters though.
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