1 ea Deep dish pie crust shell,ba 1 t Unflavored gelatin 1/4 c Water 3 ea Large eggs,separated 1 c Sugar 1/2 c Lemon juice 2 t Grated lemon peel 3 dr Yellow food coloring,optiona 1 c Whipped topping,thawed 1 x Chocolate shavings,garnish 1 x Lemon slices,garnish Soak gelatin in water.In double boiler over gently simmering water, beat yolks;add 1/2 cup sugar and lemon juice.Cook,stirring until mixture coats the bottom of a spoon.Add grated lemon peel,gelatin and food coloring.Stir well.Cool in refrigerator about 1/2 hour until slightly thickened.Beat egg whites with 1/2 cup sugar;fold into lemon mixture.Fold in whipped topping.Spoon into baked pie crust.Refrigerate 2 to 3 hours before serving.garnish with chocolate shavings and lemon slices.Serves 8.