You will need a pre-made pie crust, lemon juice, egg yolks, lemon zest, and sweetened condensed milk.
In a mixing bowl, combine the lemon juice and sweetened condensed milk.
Beat the egg yolks and lemon zest until light and fluffy.
Combine the lemon juice mixture with the egg yolks and pour the filling into the graham cracker crust.
Bake the pie at 325 degrees for 25 minutes. Allow it to cool for one hour, then refrigerate for at least 6 hours.
Cut the pie into 8 slices and serve, topped with whipped cream!