In a saucepan, combine 1 cup of the milk, 1/4 cup of the sugar, 1/4 cup of the nuts, the salt and the vanilla; scald. Mix the remaining 1/3 cup milk with egg and cornstarch. Thoroughly stir some of hot mixture into egg mixture; return all to saucepan. Cook 5 more minutes, stirring constantly, until mixture thickens. Cool 1 hour. Beat egg whites until soft peaks form; fold carefully into cooled mixture. Pour into pie shell; chill. Before serving, top with sweeteded whipped cream and remaining 1/4 cup nuts. Makes 8 servings.