Key Lime Pie
["6 egg yolks", "1 (14 oz.) can sweetened condensed milk", "2 tsp. grated lime rind", "2 to 3 drops green food coloring", "1/2 c. lime juice", "10-inch graham cracker crust", "Cool Whip"]
["Preheat oven to 250\u00b0.", "Beat egg yolks in a medium mixing bowl. Pour in condensed milk, stirring constantly.", "Add lime juice and rind. Add food coloring; stir until blended.", "Pour mixture into graham cracker crust.", "Place pie in oven and bake 15 minutes. Transfer to rack; let cool.", "Spread Cool Whip on cooled pie."]
["egg yolks", "condensed milk", "lime rind", "lime juice", "graham cracker crust"]