Key Lime Pie
["1 Tbsp. unflavored gelatin", "1/2 c. sugar", "1/4 tsp. salt", "4 egg yolks", "1/2 c. lime juice", "1/4 c. water", "1 tsp. grated lime peel", "few drops food coloring", "4 egg whites", "1/2 c. sugar", "1 c. heavy cream, whipped", "1 (9-inch) pie shell, baked"]
["Thoroughly mix the gelatin, sugar and salt in a saucepan. Beat together the egg yolks, lime juice and water; stir into the gelatin mixture. Cook over medium heat, stirring constantly, just until the mixture comes to a boil.", "Remove from the heat; stir in the grated peel.", "Add the food coloring sparingly to give a pale green color.", "Chill, stirring occasionally, until mixture mounds slightly when dropped from spoon. Beat the egg whites until soft peaks form; gradually add 1/2 cup sugar, beating to stiff peaks. Fold the gelatin mixture into the egg whites; fold the whipped cream.", "Pile into the pastry shell.", "Chill until firm.", "Spread with additional whipped cream and edge with grated lime."]
["unflavored gelatin", "sugar", "salt", "egg yolks", "lime juice", "water", "lime peel", "coloring", "egg whites", "sugar", "heavy cream", "pie shell"]