Chill milk until ice cold. Soften gelatin in lemon juice. Combine peach syrup, sugar, salt and marshmallows and cook and stir over very low heat until marshmallows are melted. Stir in softened gelatin and lemon rind. Chill until slightly thicker than unbeaten egg whites. Whip chilled milk with cold rotary beater until fluffy. Fold into cold gelatin mixture. Fold in well-drained peach slices. Pour into baked pastry shell and chill until firm. Decorate with additional peach slices. Serves 6-8.