Shake hard for 20 to 30 seconds until very cold and frothy.
Strain quickly into the chilled coupe glass.
Garnish with three coffee beans.
Notes
Use a freshly pulled espresso, hot with crema. The crema is what creates the frothy top. Cold brew or instant will still make a pretty good tasting drink but you'll get little to no foam.Shake hard for a full 20 to 30 seconds. This is what creates the foam and gets the drink properly cold.Strain quickly after shaking so the froth makes it into the glass before it settles.The coffee liqueur sweetens the drink, so taste it before adding anything extra. A small splash of simple syrup, vanilla syrup, or cinnamon syrup works well if you want it a little sweeter or more flavored.If you don't have an espresso machine, a moka pot is the next best option. Brew it as strong as you can.