I looked up the actual desert itself... this is basically what's in it (sounds yummy... I am already interested and may have specific suggestions for flavors to make an e-juice):
"Before beginning this recipe, I encourage you to have all of your ingredients ready. You need strong espresso, Grand Marnier (optional– see below), ladyfingers, mascarpone, rum, eggs, sugar, heavy cream, vanilla extract, salt, and unsweetened cocoa powder."
So (off the top of my head... wherever that is

) sounds like you will need these flavors (in general... will post specific brands later):
coffee, cake, rum, custard (for the eggs/cream) vanilla (most custards are already vanilla), and cocoa. Optional would be orange (Grand Marnier) This really does sound good and I have all the flavors except rum.