2 teaspoons granulated sugar – optional; adjust to taste
2 teaspoons simple syrup – optional; adjust to taste
ice cubes – for serving
0.25 cups milk – cold
Instructions
Add the ice cubes for shaking to a cocktail shaker and set it aside.
Brew the espresso into a small pitcher or cup; immediately stir in the granulated sugar, if using, until fully dissolved, then pour the sweetened or unsweetened espresso into the prepared shaker.
Add the simple syrup, if using; seal and shake hard until very cold and lightly frothy, 10–15 seconds. Strain into a 12–14 ounce glass filled with the ice cubes for serving.
Froth the cold milk with a steam wand on low aeration or a handheld frother until thick, glossy microfoam that holds soft peaks, 15–30 seconds. Spoon a 1/2–3/4 inch (1–2 cm) cap of foam over the drink and serve immediately.