White Christmas Pie

1 tablespoon unflavored gelatin
1/4 cup cold water
1 cup white sugar
4 tablespoons all-purpose flour
1/2 teaspoon salt
1 1/2 cups milk
3/4 teaspoon vanilla extract
1/2 cup whipping cream
3 egg whites
1/4 teaspoon cream of tartar
1 cup coconut
1 - 9 inch baked pie shell
coconut
                   
1. Soften gelatin in cold water. 
2. Combine 1/2 cup sugar, flour, and salt in a saucepan.
   Gradually stir in milk. Cook over low heat, stirring until it
   boils. Boil for 1 minute, and remove from heat. Transfer
   to a large bowl. Stir in softened gelatin. When partially
   set, beat with a rotary mixer until smooth. Blend in
   vanilla. 
3. Whip the cream until stiff. Gently fold into gelatin
   mixture. 
4. In a clean bowl, beat egg whites until frothy. Beat in
   cream of tartar, 1/2 cup sugar, and 1 cup coconut.
   Continue beating until egg whites form stiff peaks. Fold
   into gelatin mixture. Pile filling into cooled pie shell.
   Sprinkle with additional coconut. Chill for 2 hours.