
In a saucepan, combine 500 g frozen raspberries, 100 g granulated sugar, and 1 tablespoon lemon juice. Heat over medium until the berries are thawed.
Once bubbling, reduce the heat to a simmer, occasionally mashing the raspberries with a spoon.
Simmer for 23-25 minutes, until thickened. To test, drag your finger through the jam on a spoon—if it holds, it’s ready!
Pour the jam into a shallow bowl, cool to room temperature, and refrigerate until ready to use.
In a small saucepan, combine 100 g granulated sugar, 120 g water, and 30 g frozen raspberries. Bring to a boil over high heat.
Let it simmer for 3 minutes, then strain the mixture into a bowl, discarding the solids.
Add 3 tablespoons of limoncello, mixing well, and allow the syrup to cool.
In a mixing bowl, combine 450 g cold mascarpone cheese, 120 g powdered sugar, 2 tablespoons lemon juice, and 1 teaspoon vanilla paste. Mix until smooth.
In another bowl, whip 480 g cold heavy cream until medium-stiff peaks form. Carefully fold the whipped cream into the mascarpone mixture until just combined.
Choose a 27x20 cm or 23x23 cm pan and add a dollop of mascarpone filling to the bottom.
Dip ladyfinger cookies briefly in the raspberry syrup, then layer them in the pan.
Add half of the mascarpone filling over the ladyfingers, followed by half of the raspberry jam. Repeat the layering with the remaining ingredients.
Cover the pan and refrigerate for at least 8 hours, preferably overnight.
Before serving, spread the remaining raspberry jam on top and garnish with fresh raspberries and lemon slices.