Megan's Tiramisu

Step 1
Start syrup: Combine white sugar and boiling water in a medium bowl; stir until sugar dissolves. Set aside.

Step 2
Prepare filling: Combine powdered sugar, mascarpone cheese, 1/4 cup tuaca, and vanilla extract in a bowl; whip with the whisk attachment of an electric mixer until smooth. Gradually add whipping cream and whip until soft peaks form.

Step 3
Continue syrup: Mix coffee and tuaca into the sugar-water mixture.

Step 4
Assemble tiramisu: Line the bottom of a 9×13-inch glass baking dish with ladyfingers. Pour 1/2 of the syrup over top, then layer with 1/2 of the filling. Add another layer of ladyfingers and cover with remaining syrup and filling. Smooth with the back of a spoon and sprinkle with grated chocolate. Refrigerate for at least 4 hours before serving.