Combine all ingredients for filling in a saucepan with NO HEAT. Mix until well blended.
Heat ingredients over medium-low heat, stirring constantly. This should take about 15 minutes; be sure to watch the pot. Bring the filling just to a boil and then remove from heat. The mixture should have a thick consistency.
Pour the filling into the pie shell. Set for 1 hour in the fridge. Whip up more whipping cream and spread on top of the pie to 1" thickness.