1. Chill the Milk: Pour the cold milk into a serving glass.
Add ice cubes if you want an extra-cold drink, but traditional dirty coffee often skips ice for a creamier texture.
2. Brew and Layer the Drink: Use your espresso machine to brew a single shot of hot espresso and the extraction will slowly melt with the cold milk. The espresso will float on top, creating a visually appealing layer.
3. Serve: Do not stir if you want to enjoy the distinct layers and taste the flavors individually.
For a more unified flavor, stir gently before drinking.