Getting to the Root of Yams and Sweet Potatoes (Good Recipes Too)
There are approximately 600 yam (Dioscorea) species and several are edible, but the most popular and readily available are the fleshy roots of Dioscorea cayennensis, or the yellow yam. African in origin, its large, elongated brown tubers have hard yellow flesh that softens up when cooked. Unlike sweet potatoes, it needs to be peeled before cooking and eating. Above ground it forms monstrous vines that can reach lengths of 40 feet, if not maintained. The tubers of this tender perennial take around a year to mature, so it's not a quick turnaround crop. Yam tubers also don't store for long, unlike the fleshy tuberous roots of sweet potato.
The sweet potato (Ipomoea batatas) is actually a morning glory, if you can believe it. It's one of those rare plants that's grown as a tasty vegetable and a pretty ornamental (yellow, purple and variegated-leaved forms are popular foliage plants). Unlike yams, this vigorous, herbaceous, trailing vine is native to Central America and the Pacific Islands. Its fleshy, tapered, tuberous roots have edible smooth thin skin that houses firm sweet flesh of white, yellow or purple-blue that softens when cooked. Above ground it forms vigorous vines that can reach lengths of 20 feet, if not maintained. Sweet potatoes can be grown any time of year, so long as growing conditions are very warm, and produce a harvestable crop in only three to four months. The tubers store well for months of kept in a dark, cool place.
Yams must be peeled, otherwise sweet potatoes and yams cook up similarly. My busy holiday schedule won't allow me to cook and share my favorite sweet and savory yam and sweet potato recipes, so I'll just share a few excellent recipes from worthy cooking sites.
1. The sweet potato pie by SheSimmers is absolutely amazing! She adds chopped pecans to the crust. Super yummy.
2. I've made Martha Stewart's watercress salad with roasted sweet potatoes with spicy, seasonal arugula and it's the bomb. It makes a pleasingly light addition to holiday meals.
3. Perfect yam fries with cumin from The Three Cheeses. Need I say more?
4. The uniquely tasty sweet potato gnocchi with crushed hazelnuts from The Italian Dish is a lot easier to make than it looks.

A bowl brimming with white-fleshed sweet potatoes ready for cooking.



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