Boil the yams in a covered pan of water until tender. Drain; drop in cold water and then slip off the skins. Rinse the cooked yams, chop and put in a large bowl. In a small bowl, whisk together the butter, honey and orange juice/zest. Add to the yams and toss gently.
Spoon into a buttered casserole dish. Sprinkle with salt, pepper and nutmeg. Bake for 30 to 40 minutes, or until golden.