Take out the mascarpone and allow it to come to room temperature. Mix with a hand mixer until it becomes creamy. Add the sugar and mix together.
Pour the heavy cream in a bowl and place over an ice bath. Beat it until it takes on a consistency similar to the mascarpone. Fold into the mascarpone.
Place the pieces of cake in a shallow bowl. Dissolve the matcha in the hot water and pour over the cake along with the liquor. Allow some time to soak.
In your seving bowl, make a layer of the soaked cake. Add some of the mascarpone on top and smooth it out. Keep making layers of cake and cream to fill the serving dish. Place in the refrigerator and allow to come together.
When serving, dust with a generous amount of Matcha to garnish.