The perfect espresso martini

Per drink
Handful of ice
25ml vodka
35ml Tia Maria or other coffee liqueur
35ml fresh espresso
Coffee beans, to garnish
Chill martini glasses in the freezer for at least 20 minutes before serving.
Put the ice in a cocktail shaker, -followed by the vodka, liqueur and lastly the coffee. Taste and add a little more liqueur if you prefer it sweeter. Shake vigorously for 20 seconds.
Strain into the chilled glasses and top with coffee beans. Serve immediately.