01 - Gently mash 10.6 oz raspberries with 2 tbsp granulated sugar and 1 tbsp lemon juice in a medium bowl. Let stand for 10 minutes to release natural juices.
02 - Beat cold heavy cream in a large bowl until soft peaks form. Add mascarpone, powdered sugar, and vanilla extract. Fold together gently until smooth and creamy.
03 - Combine cooled coffee and raspberry liqueur (if using) in a shallow dish for dipping ladyfingers.
04 - Quickly dip each ladyfinger in coffee mixture—do not soak. Arrange a single layer in an 8x8 inch dish.
05 - Spread half the macerated raspberries evenly over the ladyfingers.
06 - Distribute half the mascarpone cream mixture over the raspberry layer.
07 - Add another layer of coffee-dipped ladyfingers over the cream.
08 - Top with remaining macerated raspberries, then finish with the rest of the mascarpone cream. Smooth the surface evenly.
09 - Cover tightly with plastic wrap. Refrigerate for at least 4 hours, preferably overnight for optimal texture.
10 - Decorate with fresh raspberries, dust with powdered sugar, and add mint leaves if desired before serving.