Good-quality sweet potatoes will be firm and smooth-skinned. They should have few eyes, and those few eyes should be shallow. The coloring is tan to light-rose.
Avoid product that is soft, wrinkled or has cuts in the skin. Sweet potatoes with white streaks or spots on the inside will be pithy.
Sweet potatoes and yams come from different species of plant in the family of morning glories, originating in separate corners of the world. What we commonly eat are sweet potatoes, which are native to the American tropics. True yams, which are native to Africa, weigh between two and eight pounds and have white to yellow flesh. Sweet potatoes, on the other hand, are generally yellow to deep orange.
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