01 -
Bring 3 cups of water to a boil in a medium saucepan. Add tapioca pearls, stir gently, and reduce heat to medium. Simmer for 20–25 minutes, stirring occasionally, until pearls are translucent with a slight dot in the center. Remove from heat, cover, and let stand for 10 minutes. Drain and rinse pearls under cold water. Toss pearls with 2 tbsp sugar, chopped pistachios, and pistachio extract (if using). Set aside to cool.
02 -
In a small bowl, whisk matcha powder with warm water until smooth. Let cool. In a chilled mixing bowl, whip heavy cream with powdered sugar and vanilla until medium peaks form. Gently fold in the matcha mixture until evenly combined. Keep refrigerated until needed.
03 -
Divide pistachio tapioca pearls evenly among four serving glasses. Spoon or pipe the matcha mousse over the pearls. Chill assembled desserts for at least 1 hour before serving.
04 -
Just before serving, sprinkle with chopped pistachios and garnish with mint leaves if desired.