35ml Kahlua coffee liqueur
1 shot (25ml) espresso
Pour the vodka, coffee liqueur and espresso into a cocktail shaker. Fill the martini glass with ice to chill and then fill the cocktail shaker with ice as well.
Put the other half of the shaker on top and give it a good tap to lock it in, then shake the living daylights out of it. You want the ice to smash up while chilling the liquid down; its what creates the frothy top. Try to use fresh-from-the-freezer ice, as melting ice is too watery and will dilute the martini.
Once shaken, tap the side of the shaker to break the vacuum seal. Empty the ice out of the Martini glass, then place the strainer on top of the shaker and pour the contents through a sieve directly into the glass. Using the strainer and the sieve helps create a rich, smooth, froth.
Garnish with 3 coffee beans and attempt to contain your delight!
(Image and recipe credit : Jamie Oliver)