Berline's Lemon Pie

In the top of a double boiler, mix sugar and flour together. Add beaten egg yolks to mixture, stirring often.

Add boiling water and lemon juice or flavoring.

Continue to stir until mixture gets really thick.

Make sure the bottom of double boiler has plenty of water in it, but not enough to cause steam to rise while stirring ingredients.

Pour into cooked pie shell.