Scoop a teaspoon of matcha powder into a small bowl. Whisk it vigorously with a splash of warm water until it forms a smooth, mossy green paste, free of lumps and with a fragrant grassy aroma.
Fill a tall glass with a generous handful of large ice cubes. Pour the cold milk over the ice, watching it cascade and crackle as it chills the glass.
Pour the prepared matcha paste into the blender. Add the honey if you like a touch of sweetness.
Blend the mixture on high speed just until it becomes frothy and smooth, about 15-20 seconds. You should see a vibrant green foam forming on top.
Pour the frothy matcha mixture directly into the glass over the ice and milk. Watch the bright green swirl settle and settle again, creating a beautiful layered effect.
Give the drink a gentle stir to combine the frothy top with the cold milk beneath, then enjoy immediately for the freshest, most vibrant flavor and texture.