Key Lime Pie
["1 can condensed milk", "4 egg yolks", "1/2 c. lime juice"]
["Combine milk, egg yolks and lime juice.", "Beat 1 egg white stiff.", "Fold into milk mixture.", "Beat 3 egg whites and gradually add 6 tablespoons sugar and 1/2 teaspoon cream of tartar.", "Put into baked pie shell; bake until egg whites are golden brown at 350\u00b0."]
["condensed milk", "egg yolks", "lime juice"]