To the double boiler, add the first three ingredients, cream of coconut, marshmellows, and milk. Melt together. Mixture may be foamy.
Add 2 cups of the coconut to the now melted mixture. Place mixture in the fridge until cool
While the mixture is cooling, toast the remaining coconut on a cookie sheet in the oven, 375 degrees. Watch closely, once its starts to turn golden, take out. It will burn very quickly.
Take the cooled mixture out of the fridge, and stir. Fold in the 2 cups of whipped heavy cream (stiff), until completely incorportated. Put completed mixture into the pie shell. (there may be some left over)