I stirred the raspberry jam with 4 tablespoons of orange liqueur in a small bowl until smooth. This step infuses the dessert with a fruity, slightly boozy flavor.
Next, I blended mascarpone with the remaining 2 tablespoons of orange liqueur. In another bowl, I whipped cream, sugar, and vanilla to soft peaks and gently folded a quarter into the mascarpone to lighten it, then added the rest for a fluffy, creamy mixture.
I lined half the ladyfingers in the baking dish and spread half of the jam mixture on top. Then I layered half of the mascarpone cream, followed by half of the fresh raspberries, repeating for a second layer.
Cover the tiramisu and refrigerate for at least 3 hours. Chilling allows the flavors to meld beautifully and the cream to set perfectly.