01 - Gently mash 10 oz raspberries with 2 tbsp granulated sugar and 1 tbsp lemon juice in a medium bowl. Let sit for 10 minutes to 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.
04 - Quickly dip each ladyfinger in coffee mixture without soaking. Arrange in a single layer in an 8x8 inch dish.
05 - Spread half of macerated raspberries evenly over ladyfingers.
06 - Spread half of mascarpone cream mixture over raspberry layer.
07 - Add another layer of coffee-dipped ladyfingers.
08 - Top with remaining raspberries, then remaining mascarpone cream. Smooth surface evenly.
09 - Cover with plastic wrap and refrigerate at least 4 hours, preferably overnight.
10 - Top with fresh raspberries, dust with powdered sugar, and add mint leaves if desired before serving.