In a large mixing bowl, combine the mascarpone, heavy cream, confectioners' sugar, molasses, vanilla, ginger, cinnamon, cloves, and nutmeg. Beat with an electric hand mixer on medium-high speed until smooth, fluffy, and holding stiff peaks. Set aside.
16 oz (454 g) mascarpone cream, 2½ cups (600 ml) heavy whipping cream, 1 cup (120 g) confectioners' sugar, 1 tbsp (20 g) unsulfured molasses, 1 tsp (5 ml) vanilla extract, 1 tsp (2 g) ground ginger, 1 tsp (3 g) ground cinnamon, ½ tsp (1 g) ground cloves, ¼ tsp (0.5 g) ground nutmeg
In a shallow bowl, whisk together the cooled brewed coffee or espresso, dark rum (if using), and molasses until the molasses is fully dissolved.
1 cup (240 ml) espresso or strong brewed coffee, 2 tbsps (30 ml) dark rum, 1 tsp (7 g) unsulfured molasses
Quickly dip half of the ladyfingers into the coffee mixture, about 1 second per side, and arrange them in a single layer in a 9×13-inch (23×33 cm) dish. The cookies should absorb the liquid without becoming soggy.
44 (2 packages) ladyfinger biscuits
Spread one third of the mascarpone cream mixture evenly over the soaked ladyfingers, smoothing it to the edges.
Arrange a full layer of gingersnap cookies over the cream. Do not dip the gingersnaps; keeping them crisp at assembly allows them to soften gradually and maintain texture.
20-25 thin, crisp gingersnap cookies
Spread another one third of the mascarpone cream over the gingersnap layer.
Dip the remaining ladyfingers into the coffee mixture and place them on top as the final cookie layer.
Spread or pipe the remaining mascarpone cream over the surface. For a decorative finish, transfer the cream to a piping bag fitted with a large round or star tip and pipe evenly across the top.
Cover the dish tightly with plastic wrap and refrigerate for at least 6 hours, or preferably overnight, until the layers have softened and the dessert is fully set.
Before serving, dust the top with cocoa powder, slice, and serve chilled. Serve each slice with a gingerbread man cookie if you like.
2 tbsps (10 g) unsweetened cocoa powder