Start by sifting the matcha powder into a small bowl or mug to remove any lumps. This crucial step ensures a smooth, clump-free latte that matches Dunkin's signature texture.
Add the hot water to the matcha powder and whisk vigorously in a zigzag or 'W' motion for 15-20 seconds until the mixture becomes frothy and bright green. The matcha should be completely dissolved with no visible powder remaining.
Stir in the vanilla syrup until well combined, creating a sweet matcha concentrate. The mixture should have a vibrant green color and smell earthy yet sweet, just like the Dunkin' original.
For a hot latte, heat the milk in a saucepan over medium heat or microwave for 60-90 seconds until steaming (about 150°F). Use a milk frother or whisk to create a light foam on top, which should take about 30 seconds of vigorous frothing.
Pour the warm, frothed milk into your serving mug, then slowly add the matcha mixture while gently stirring. The drink should turn a beautiful pale green color as the matcha blends with the milk.
For an iced version, fill a tall glass with ice cubes and pour the cold milk over the ice. Add the matcha mixture and stir well for 10-15 seconds until the color is evenly distributed throughout the drink.
Give your latte a final stir and taste for sweetness, adding an extra splash of vanilla syrup if desired. The finished drink should have a creamy texture, balanced sweetness, and that distinctive Dunkin' matcha flavor that's both refreshing and indulgent.