This drink belongs to the Italian tradition of the ammazzacaffè (literally "coffee killer"), the small shot of liquor taken after coffee to round off a meal and help digestion. Pairing espresso with sambuca, the anise liqueur most associated with central Italy and Rome, is one of the most common versions you'll find in homes and bars across the country. The garnish of three coffee beans, known as con la mosca ("with the fly"), is a Roman touch said to represent health, happiness, and prosperity. Some people enjoy briefly flaming the sambuca to lightly toast the beans, though plenty serve it simply with no fuss at all.