1 baked 9-inch pastry shell
1 tbsp. unflavored gelatin
1 c. sugar
1/4 tsp. salt
4 eggs, separated
1/2 c. water
1 tbsp. grated lime peel
1/2 c. lime juice
Green food color
1 c. heavy cream, whipped

Mix gelatin, 1/2 cup sugar, and salt in a saucepan. Beat together egg yolks and water; stir into gelatin mixture. Cook over medium heat, stirring constantly until mixture boils.

Remove from heat and stir in grated peel and lime juice. Add enough food coloring to make a pale green color. Chill, stirring occasionally, until thick. Beat egg whites until stiff peaks form.