Livorno Punch (Ponce alla Livornese)

Place a thick-cut, coin-sized lemon zest in the base of a shot glass and cover it with the powdered sugar.

Utilize the steam wand of a coffee machine to steam and moisten the sugar while also warming the glass. Alternatively, add a splash of boiling water to achieve the same effect.

Muddle the lemon zest and sugar together at the base of the glass using a small muddler.

Pour in the Havana Club Añejo 7 Años Cuban Rum.

Top with freshly made hot espresso, dispensed directly from the machine into your cocktail.