Chill the cocktail glass.

Put all the liquid ingredients into the Boston glass.

Shake it with plenty of ice for 8 seconds.

Shake with firm and ‘long’ movements, allowing the oil from the espresso shot to bind oxygen as best as possible to create the thick, luscious foam that defines a good Espresso Martini.

Pour the cocktail through a fine strainer into the chilled cocktail glass and garnish with three coffee beans.