Stir together 2 tablespoons water and rum flavoring in a small bowl. Sprinkle gelatin over mixture. Stir mixture, and set aside. (this mixture will set up in bowl).
-Note if using rum, 2 tablespoons. If using flavoring, reduce the amount to 2 teaspoons. Flavoring is more potent than the real deal.
-I have used both name brand and store brand gingersnap cookies, the store brand are usually less than half price, and taste the same. This time I purchased Kroger (Smith's) brand.
-You will have four layers when finished. Crust, chocolate mixture, custard mixture, whipping cream.
-Make this early in the day or the day before serving, so the layers have time to set up. The crust will not get soggy if cooked properly.