- Prepare the matcha mixture: In a small bowl, whisk together 2 tablespoons of sifted matcha powder and 1/2 cup of hot water until smooth. Let cool slightly. 
- If using, stir matcha liqueur or rum into the cooled coffee. 
- Lightly dip each ladyfinger into the coffee mixture and arrange in a single layer at the bottom of a 8x8 inch dish. Avoid soaking excessively. 
- In a large bowl, beat the cold heavy cream with an electric mixer until soft peaks form. 
- In a separate bowl, beat the mascarpone cheese and granulated sugar until smooth and creamy. 
- Gently fold the whipped cream into the mascarpone mixture until well combined. Be careful not to overmix. 
- Spread half of the mascarpone cream mixture evenly over the layer of ladyfingers. 
- Repeat layers: Dip the remaining ladyfingers in the coffee mixture and arrange over the cream layer. Spread the remaining mascarpone cream over the ladyfingers. 
- Cover the dish with plastic wrap and refrigerate for at least 4 hours, or preferably overnight, to allow the flavors to meld and the tiramisu to set. 
- Before serving, dust the top generously with additional sifted matcha powder. 
- Cut into squares and serve chilled. 
- Optional Tips: For a richer flavor, use full-fat mascarpone cheese. If a thicker consistency is desired, consider adding a stabilizer like a teaspoon of gelatin dissolved in a tablespoon of cold water and then gently warmed before incorporating into the cream mixture. For a vegan version, use plant-based mascarpone and heavy cream alternatives. Ladyfingers can be substituted with sponge cake slices if needed.