For Graham Cracker Crust:
Preheat oven to 375 degrees F.Mix graham cracker, sugar, and melted butter in mixing bowl.
Press into pie dish. Bake for 7 mins. and let cool.
For Lemon Custard Pie:
Preheat oven to 325 degrees F. In a large bowl, beat sugar and butter until well blended.
Add egg yolks one at a time, beating well. Add milk, flour, and salt, mix well.
Stir in lemon juice and peel, set aside.
In a small bowl, beat egg whites until stiff peaks form. Gently fold whites into lemon mixture. Pour into pie shell and bake for one hour.