1. Place the yams in cold, unsalted water, bring to a full boil, and cook 25 minutes, or until soft. 2. Remove the yams, cook, and peel. Mash with the other ingredients. 3. Place in a food processor, and run briefly to remove lumps. DO NOT PUREE! (If a processor is not available, go directly to step 4.) 4. Remove foofoo to a bowl, and beat with a wooden spoon or wire whisk until smooth. The foofoo should have a sticky, slightly resilient consistency. 5. Shape the foofoo into balls with your hands, and serve warm.