Roger'S Favorite Lemon Icebox Pie
["1 can sweetened condensed milk", "1 9-inch graham cracker crust", "1/3 c. lemon juice", "1/2 c. cool whip", "Few drops yellow food coloring added to filling (optional)"]
["Mix milk, lemon juice, and cool whip in large bowl until smooth. Pour into pie crust. Chill in refrigerator for 1 hour before serving."]
["condensed milk", "graham cracker crust", "lemon juice", "cool whip", "filling"]