Cut yams in half and boil until tender but firm (about 20 minutes).
When cool enough to handle, peel and slice into 1/4-inch thickness.
Combine sugar, flour, salt, cinnamon, nutmeg, and grated orange peel.
Place half of the sliced yams in a medium-sized casserole dish.
Sprinkle with spiced sugar mixture.
Dot with half the amount of margarine.
Add a second layer of yams, using the rest of the ingredients in the same order as above. Add orange juice.
Bake uncovered in oven preheated to 350° F for 20 minutes.

6 servings