Butterscotch Raisin Pie Recipe

Mix brown sugar, cornstarch, salt, and milk together. Beat the egg yolks and add to the milk. Cook over medium heat until thick, stirring constantly. Remove from heat. Add butter, vanilla and raisins. Stir and pour into a baked pie shell. Beat the egg whites until frothy. Add cream of tartar and sugar. Beat until stiff. Pour over filling. Bake at 350° until golden brown.