Key Lime Pie
["4 eggs, separated (separate 1 egg white by itself)", "1 (14 oz.) can sweetened condensed milk (not evaporated)", "1/2 c. lime juice", "green food coloring", "1/2 tsp. cream of tartar", "1/3 c. sugar", "1 (8 or 9-inch) baked pie shell"]
["Beat the egg yolks; stir in the sweetened condensed milk, lime juice and a few drops of green food coloring.", "In a small bowl, stiffly beat 1 egg white; fold into the milk mixture.", "Turn into baked and cooled 8 or 9-inch pastry shell.", "Beat 3 egg whites with cream of tartar until foamy; gradually beat in the sugar, one tablespoon at a time, until meringue is stiff, but not dry. Spread on top of pie, sealing carefully to edge of shell.", "Bake in 350\u00b0 oven for 15 minutes or until meringue is golden.", "Cool. Chill before serving."]
["eggs", "condensed milk", "lime juice", "green food coloring", "cream of tartar", "sugar", "shell"]