The latter combo is called a caffè corretto, a shot of fresh espresso "corrected" with a dash of liqueur. Sambuca is also served as an ammazzacaffè, or "coffee killer": Strong liquors consumed ...

pop the pre-sugared cooked kisses on a rack over a tin in a 150C/Gas 2 oven, and keep them warm for up to one hour. Serve with an espresso, with one teaspoon of sambuca added, for each person.