Bake a 9 inch pie crust at 350 degrees until golden brown. Cool on wire rack.
In a saucepan; combine brown sugar, butter, flour, egg yolks, salt, vanilla extract, milk and water. On medium heat bring to a boil, stirring constantly so it doesn't scorch; reduce heat and stir until filling thickens. Cool slightly; then pour into pie crust.
In a mixing bowl; add egg whites and sugar. Using a hand mixer; mix on medium high speed until soft peek's form. Pour mixture on pie and bake at 350 degrees until meringue is browned. Cool on wire rack and refrigerate left overs.