Melon Bang drink recipe

I use 3/4 of a honeydew melon, but it's not on the list and mangos should work too. Scoop the melon innards into a blender, and freeze the blender for a couple of hours. Add a try of ice cubes and the rum, and blend until smooth. Add the vanilla and sugar, blend again quickly. Pour into highballs, and float a layer of grand marnier on top. Can add green food colouring if necessary, but I prefer without.