Pour hot milk over the sugar and flour and cook in a heavy saucepan, stirring, until thickened.Remove from heat and beat a bit of the hot mixture into the eggs, then beat the eggs back into the mixture.Return to the heat and cook 2 minutes longer.Stir in the vanilla.Pour into a 9” baked pie crust.For a meringue topping:beat the egg whites with 1/2 teaspoon cream of tartar until frothy and beat in 6 tablespoons sugar until soft peaks form.Spread over filling and bake in a 350 º F. oven until golden brown.Or….top pie with freshly whipped, lightly sweetened cream.Chill.