1 1/2 tsp. unflavored gelatin
1/2 c. lemon juice
2 c. skim milk
1 tsp. grated lemon rind
3/4 c. sugar
1 egg whites, stiffly beaten

Soak gelatin in 2 tablespoons of water for 5 minutes. Heat milk and sugar, add gelatin and stir until dissolved. Chill. Gradually stir in lemon juice and lemon rind. Pour into freezing tray, freeze until "mushy."

Turn into a chilled bowl and beat until fluffy, but not melted. Fold in stiffly beaten egg whites. Return to freezing unit and freeze until firm.