A starchy, nutrient-rich root vegetable of the genus Dioscorea, the yam thrives in a tropical belt across West Africa, with outliers in the Caribbean and some Asian countries such as Japan.

Yams are considered one of the world’s most important crops. A starchy, nutrient-rich root vegetable of the genus Dioscorea, the yam thrives in a tropical belt across West Africa, with outliers ...