||Beat egg yolks until thickened.
||Stir in juice, salt and 1/2 cup of the sugar. Cook over low heat, stirring constantly, until mixture thickens.
||Soften gelatin in water; add to hot mixture, stirring until gelatin is dissolved.
||Stir in lemon rind; chill until mixture begins to congeal.
||In small bowl of electric mixer, beat egg whites until soft peaks form.
||Fold in the gelatin mixture.
||Pour into pie shell and chill until firm.
||Top with whipped cream before serving.