Banana Sweet Potatoes

Directions

1. 1
   In a large saucepan cook sweet potatoes, covered, in enough boiling salted water to cover for 30-40 minutes or until tender; drain.
2. 2
   Preheat oven to 350 degrees Fahrenheit.
3. 3
   Peel potatoes; mash on low speed of electric mixer (do not add butter or milk).
4. 4
   Add banana, butter or margarine, lemon peel, and salt. Beat until fluffy.
5. 5
   Add yolks; beat well. Carefully fold stiff-beaten egg whites into potato mixture; turn into a buttered 1 1/2-quart casserole.
6. 6
   Bake, covered, at 350 degrees Fahrenheit for 20 minutes; uncover and bake 25 minutes.