Grand prize winning maple walnut mousse pie

MMMMM----- Recipe via Meal-Master (tm) v8.01
  
       Title: Grand Prize Winning Maple Walnut Mousse Pie
  Categories: Pies, Nuts, Freezer, Chocolate
       Yield: 8 servings
  
       3    Eggs; separated
     1/8 ts Salt
     3/4 c  Maple syrup
       2 c  Cool Whip
       1 c  Walnuts; chopped
       2 tb Semi-sweet chocolate; shaved
       1    Chocolate crumb pie shell
  
   Beat egg yolks until lemon colored. Add salt and maple syrup. Cook in
   top of double boiler until yolk mixture thickens. Cool. Beat egg
   whites until stiff. Combine maple mixture, egg whites, and 2/3 of the
   Cool Whip, using a folding motion. Fold in 3/4 cup of the nut meats.
   Scrape into baked pie shell. Cover with remaining whipped topping.
   Sprinkle with remaining nut meats and chocolate shavings. Freeze for
   a minimum of four hours.
  
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