The flesh of the yam should feel firm. They can be safely kept for up to two weeks. Uncooked yams should never be refrigerated. Cooked yams can be refrigerated for 3 days. Unlike the sweet potato, yams cannot be eaten raw.
Uncooked yams are toxic.
Preheat oven to 350-degrees. Peel fresh yams and precook in boiling water until they are soft and tender. Canned yams can be drained. In a shallow baking dish, layer yams. Pour orange juice over vegetables.