Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
                        ----Crust----
   1      c             graham cracker crumbs
   3      Tablespoons         granulated sugar
   3      Tablespoons         margarine -- melted
                        ----Filling----
  16      ozs           fat-free cream cheese -- softened
   1      c             granulated sugar
   3      Tablespoons         unbleached flour
   2      Tablespoons         lemon juice
   1      Tablespoon          lemon peel -- grated
   1      tsp           vanilla
   3                    egg whites -- whipped
                        ----Topping----
     3/4  c             granulated sugar
   2      Tablespoons         cornstarch
     1/2  c             water
     1/4  c             lemon juice

Preparation:

Preheat oven at 325. Prepare a 9" pie pan with cooking spray and flour. To prepare crust, combine crumbs, 3 tablespoons sugar and margarine in a small mixing bowl. Press into bottom of prepared pan. Bake for 10 minutes. Meanwhile, to prepare filling, combine cream cheese, 1 cup sugar, flour, 1 tablespoon lemon juice, lemon peel, vanilla, and egg whites in a mixing bowl until smooth. Pour over crust. Bake for 35 minutes. While cooling prepare topping. To prepare it, combine remaining sugar and cornstarch in saucepan; stir in water and remaining lemon juice. Cook, stirring constantly, until clear and thickened. Spoon over cooled cake. Chill before serving.