Mix all ingredients, cook over medium heat until boiling for approx. 5 minutes, stirring constantly.
While filling is cooking whip egg whites until frothy, add 4 tsp sugar and beat on high until mixture is shiny and holds a formed peak. Place filling into a 10" baked shell , cover with meringue making peaks with spatula. Place in a 350° oven and brown til golden. Cool for several hours. Serves 7 large pieces.