To make the coffee shrub, pour the coffee or espresso into a jug with the sugar. Stir to dissolve, then leave the mixture to cool completely before adding the vinegar. Transfer to the fridge and chill until needed. Can be made up to a day ahead.

To make the cocktail, put two martini or small coupe glasses in the fridge to chill until cold.

Half-fill a cocktail shaker with ice, then add 50ml of the coffee shrub, the vodka and coffee or espresso. Shake really well, until the outside of the shaker feels cold, then strain into the chilled glasses. Top each with two coffee beans and a cardamom pod.