Layered Walnut Pumpkin Pie
["3/4 c. Diamond walnuts", "1 envelope unflavored gelatin", "1/4 c. cold water", "1 (1 lb.) can pumpkin", "3/4 c. granulated sugar", "1/2 c. milk", "3 large eggs, separated", "1 tsp. pumpkin pie spice", "1/2 tsp. salt", "1/4 tsp. vanilla", "1 c. whipping cream", "1 (9-inch) cooked pie shell", "Diamond walnut halves (for decoration)"]
["Chop walnuts fine; set aside.", "Soften gelatin in water in a 2-quart saucepan.", "Stir in pumpkin, 1/2 cup of the sugar, milk, lightly beaten egg yolks, spice and salt.", "Heat just to boiling, stirring constantly.", "Turn heat very low.", "Cook 5 minutes, stirring.", "Remove from heat.", "Add vanilla and Cool Whip.", "Chill until mixture thickens slightly."]
["walnuts", "unflavored gelatin", "cold water", "pumpkin", "sugar", "milk", "eggs", "pumpkin pie spice", "salt", "vanilla", "whipping cream", "shell"]