Iced Matcha Latte

Heat milk in a large heatproof glass measuring cup in a microwave on high until very hot but not boiling, about 45 seconds (or, heat milk in a small saucepan over medium). Using an immersion blender, carefully blend on medium speed, moving blade up and down through milk, until foamy, about 30 seconds. (Alternatively, whisk vigorously.)

Combine matcha, sugar, and ½ cup water in an ice-filled cocktail shaker. Cover and shake vigorously until outside of shaker is very cold and latte is frothy, 30 seconds. Using a cocktail strainer or slotted spoon to hold back ice while allowing foam and small ice chips to pass through, pour into a tall, ice-filled glass. Top off with frothy milk.