01 - In a bowl, vigorously whisk matcha powder with hot water until fully dissolved and smooth. Stir in granulated sugar and cool to room temperature.
02 - Combine egg yolks and granulated sugar in a heatproof bowl. Set over simmering water and whisk until pale and thick, about 5 minutes. Remove from heat and allow to cool.
03 - In a large bowl, blend chilled mascarpone cheese with vanilla extract until the texture is smooth and creamy.
04 - In a separate bowl, whip heavy cream to stiff peaks using a whisk or electric mixer.
05 - Fold the cooled egg yolk mixture into the mascarpone. Gently incorporate whipped cream, combining until homogeneous.
06 - Briefly dip each ladyfinger into the cooled matcha mixture, ensuring they are moistened but not soggy. Lay a single layer on the base of a 8-inch square dish.
07 - Spread half of the mascarpone cream evenly over the ladyfingers.
08 - Repeat with another layer of matcha-dipped ladyfingers and smooth the remaining mascarpone cream over the top.
09 - Cover the dish and refrigerate for a minimum of 4 hours or overnight to set thoroughly.
10 - Just before serving, sift matcha powder generously over the surface using a fine sieve.