Add flour, salt, and eggs. Beat till smooth. Add buttermilk, lemon juice, and vanilla and blend well. (Mixture may appear curdled.)
Pour filling into a 9″ pie crust. I like to use a deep dish.
Place pie pan on a cookie sheet and place in an oven that has been preheated to 350°. Bake for 50-55 minutes or till lightly browned on top and mostly set.
Place pie on a cooling rack to cool. Serve at room temperature, and refrigerate any leftovers.