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Yam (Dioscorea Alata)
There are about 600 species of yams, and many are poisonous as they contain alkaloid dioscorine.
When found for sale they should be treated in the same way as potatoes or sweet potatoes, but have little of the charm of these two vegetables to recommend them! In Africa they are pounded to make flour to make fufu and suchlike. They are very popular amongst the West Indies community. However, they have only a poor nutritional value, especially when compared to sweet potatoes, which have three times the vitamin C content, plus a good helping of vitamin A.