In glass bowl, mix gelatin, sugar, and spice. Stir in milk and egg yolks.let stand 1 minute. Cook on medium for 6 minutes, stirring twice. Stir in pumpkin. Place bowl in ice water. chill 15 minutes, until thickened. Fold in 2 cups topping. Spoon into crust. Chill 2 hours. Decorate with remaining topping ----