Brew your espresso shots using an espresso machine or prepare strong cold brew concentrate. Allow the espresso to cool for 2-3 minutes at room temperature so it doesn't melt all the ice immediately. The coffee should be strong and aromatic with a rich, dark appearance.
Fill a tall 16-ounce glass with ice cubes, filling it about three-quarters full. The ice should reach near the top of the glass, creating a solid foundation that will keep your latte cold and refreshing.
Pour the vanilla syrup over the ice in the glass, allowing it to settle at the bottom. The syrup will coat the ice cubes and create a sweet base layer for your drink.
Add the cooled espresso shots directly over the ice and vanilla syrup. Watch as the dark coffee cascades over the ice, creating beautiful layers that will mix together as you drink.
Pour the cold milk slowly over the espresso and ice, filling the glass almost to the top but leaving about an inch of space for the foam. The milk will naturally blend with the coffee, creating a creamy caramel-colored latte.
Prepare the cold foam by combining the cold milk and vanilla syrup in a cocktail shaker or mason jar with a tight-fitting lid. Shake vigorously for 30-45 seconds until the milk becomes thick, frothy, and has doubled in volume with a velvety texture.
Gently spoon or pour the cold foam over the top of your iced latte, allowing it to float on the surface. The foam should create a thick, creamy layer that sits beautifully on top of the drink, just like at Dunkin'.
Serve immediately with a straw, allowing the drinker to enjoy the layers of foam, sweet vanilla, and rich coffee. Stir gently before drinking if you prefer a more uniform taste, or sip through the foam for the authentic Dunkin' experience.
