1 can sweet potatoes, cooked and mashed
1 tbsp. soft butter
1/3 c. hot skim milk
2 tsp. grated lemon rind
1/2 tsp. salt
Pepper, as desired
2 egg whites, stiffly beaten

Add hot milk and butter to sweet potatoes and beat until fluffy. Add lemon rind, salt and pepper. Fold in stiffly beaten egg whites. Bake in greased casserole at 400 degrees for 35 minutes. Yield: 4 servings; 90 calories per serving.