Lemon Pie
["1 (14 oz.) can sweetened condensed milk", "1/2 c. lemon juice", "1 (8 oz.) carton frozen whipped topping, thawed", "few drops yellow food coloring (optional)", "1 prepared graham cracker crust (8 or 9-inch)"]
["In a medium bowl, combine milk and juice.", "Let stand a few minutes.", "Stir in whipped topping.", "Add food coloring, if desired. Spoon into crust.", "Chill until firm.", "Yields 6 servings."]
["condensed milk", "lemon juice", "frozen whipped topping", "coloring", "graham cracker crust"]