Yams and sweet potatoes are not the same thing. In fact, you've probably bought a sweet potato, thinking it was yam!
There are many types of sweet potatoes ranging from white, yellow, red, purple, or brown on the outside with white, yellow, orange, and reddish flesh inside. There are also sweet potatoes that soften during cooking and those that stay firm.
Sweet - Potatoes - Market - US - Growers
When softer sweet potatoes first hit the market in the US, growers needed a way to differentiate between the two. The soft sweet potatoes resembled African...