Place matcha powder in a bowl with 2 ounces hot water (175°F).
Whisk matcha until smooth with no clumps.
Juice tangerines and strain pulp.
Fill two tall glasses with ice cubes.
Pour 1 ounce simple syrup into each glass.
Add 2 ounces tangerine juice to each glass.
Pour 1 ounce matcha mixture into each glass.
Top each glass with 4 ounces sparkling water.
Stir gently with a cocktail spoon.
Garnish with mint leaves and tangerine slices.
Notes
Store leftover simple syrup in the refrigerator for up to 2 weeks.Fresh tangerine juice works best, but orange juice can substitute in a pinch.For best results, use ceremonial grade matcha powder rather than culinary grade.The drink should be served right away while bubbles are fresh and ice is cold.Pre-chill glasses in the freezer for 10 minutes before making drinks.