Separate eggs. Reserve whites. Beat yolks until light lemony-colored.
Mix together flour and sugar.
Add sugar mixture to egg yolks and beat until mixed well.
Add buttermilk and melted butter, mix well. Beat egg whites until stiff. Fold into filling.
Pour into an unbaked pie crust and bake at 350 degrees for 40 minutes or until the pie is set and the top is golden brown. If you like to use homemade pie crusts, my Butter crust is perfect for this lemony, creamy filling.