Irish Cream Tiramisu

I've long been tinkering about with a bottle of Bailey's, seeing how it could best be called upon in the kitchen, and I think, with this, I've found it. An Italian friend of mine, who makes a killer tiramisu herself, was an instant convert. I was relieved: the Italians generally are conservative about their food, which goes some way to explaining the longevity of their cherished culinary traditions. But this only sounds like some sort of joke — "Did you hear the one about the Irishman and the Italian...?" — and in reality is an elegantly buff-tinted, creamy-toned variant of the punchy, if comfortably cliched, original. And please read the Additional Information section at the end of the recipe before proceeding.