01 - In a medium bowl, gently mash 10.6 oz raspberries with 2 tbsp granulated sugar and 1 tbsp lemon juice. Set aside for 10 minutes to allow the berries to release their juices.
02 - In a large bowl, beat the cold heavy cream until soft peaks form. Add mascarpone, powdered sugar, and vanilla extract. Gently fold together until smooth and creamy, being careful not to overmix.
03 - In a shallow dish, combine the cooled coffee and raspberry liqueur if using. This will be used to dip the ladyfingers.
04 - Quickly dip each ladyfinger in the coffee mixture for just 1-2 seconds per side—do not soak. Arrange a single layer of dipped ladyfingers in an 8x8 inch dish, breaking pieces as needed to fit.
05 - Spoon half of the macerated raspberries over the ladyfingers, spreading evenly to distribute the fruit and juices.
06 - Spread half of the mascarpone cream mixture over the raspberry layer, using an offset spatula to create an even surface.
07 - Add a second layer of coffee-dipped ladyfingers, following the same quick-dipping method.
08 - Top with the remaining macerated raspberries, then finish with the rest of the mascarpone cream. Smooth the top surface with your spatula for an even finish.
09 - Cover tightly with plastic wrap and refrigerate for at least 4 hours, though overnight chilling yields the best texture and flavor integration.
10 - Just before serving, arrange fresh raspberries on top, dust generously with powdered sugar, and add mint leaves if desired. Cut into squares and serve chilled.