Brew a double shot of espresso and place it in a cocktail shaker or mason jar.
Add the classic syrup and ice. Secure the lid and shake vigorously for about 15-30 seconds. The espresso should be cold and foamy.
Pour the mixture, along with the ice, into your desired drinking glass (or drink right from the mason jar). Top off with milk. Stir and enjoy immediately.
Notes
Feel free to add another shot of espresso, more/less syrup, a different flavor of syrup, or change up the milk to suit your preferences!