01 - Gently mash 10.6 oz raspberries with 2 tbsp granulated sugar and 1 tbsp lemon juice in a medium bowl. Let sit for 10 minutes to macerate and release juices.
02 - Beat cold heavy cream in a large bowl until soft peaks form. Add mascarpone, powdered sugar, and vanilla extract. Fold 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 in a single layer in an 8x8 inch dish.
05 - Spoon half the macerated raspberries over ladyfingers, spreading evenly to cover.
06 - Spread half the mascarpone cream mixture over the raspberry layer in an even layer.
07 - Add another layer of coffee-dipped ladyfingers over the cream.
08 - Top with remaining macerated raspberries, then remaining mascarpone cream. Smooth surface with spatula.
09 - Cover tightly with plastic wrap. Refrigerate at least 4 hours, preferably overnight for best flavor and texture.
10 - Top with fresh raspberries, dust with powdered sugar, and add mint leaves if desired before serving.