To make an espresso martini, follow these steps: Ingredients:

• 2 ounces vodka
• 1/2 ounce coffee liqueur (usually Kahlúa)
• 1 ounce freshly brewed espresso (or cold brew concentrate)
• 1/2 ounce simple syrup
• Ice
• Garnish: 3 coffee beans

Instructions:

1. Brew the espresso and let it cool completely (cooling prevents melting the ice and diluting the cocktail).
2. Fill a cocktail shaker with ice.
3. Add the cooled espresso, vodka, coffee liqueur, and simple syrup to the shaker.
4. Shake the cocktail very hard for a frothy texture on top.
5. Strain the mixture quickly into a chilled martini or coupe glass.
6. Garnish with three coffee beans on top (these traditionally represent health, wealth, and happiness).

Tips:

• To cool the espresso quickly, place it in the freezer for a few minutes.
• Shaking the cocktail vigorously is key to creating a nice foam on top, called crema.
• If you don't have simple syrup, you can make it by boiling equal parts of sugar and water until dissolved, then cooling it.
• Avoid using instant coffee as it won't give the frothy crema effect; espresso from a coffee machine is best.
• If you want extra foam, you can add an egg white to the shaker (optional).

This recipe results in a smooth, rich, and slightly sweet coffee cocktail with a delightful caffeinated kick.