Lemon Meringue Pie

This is Sweet Harold's all time favorite pie. Perfect amount of tart here from the lemons. 

1/2 cup all purpose flour
1 cup sugar
1 T. butter
1/2 t. salt
2 cups boiling water
juice and grated rind of 1 lemon
3 eggs, separated
1 baked pie crust, cooled

Mix flour, sugar, butter, salt, boiling water, lemon juice and rind and egg yolks in a double boiler. Cook, stirring constantly, until thick. Pour into pie crust.

Beat eggs whites with a pinch of salt and 1/4 cup sugar until stiff peaks form. Top pie and bake in a 350 degree oven for 10 minutes or until meringue is browned.