Rich and Creamy Tiramisu

Name: Rich and Creamy Tiramisu
Prep time: 30 min
Cook time: 10 min
Total time: 40 min
Yield: 12
Ingredients: For the Coffee Syrup:; 3/4 ounce Dutch-processed cocoa powder (about 1/4 cup; 20g), such as Valrhona; 5 ounces espresso or strong brewed coffee (about 2/3 cup; 140g), piping-hot; 2 ounces crème de cacao or other dark liqueur (about 1/4 cup; 55g); see note; 2 ounces Cardamaro or other mild amaro (about 1/4 cup; 55g); see note; 1/2 ounce vanilla extract (about 1 tablespoon; 15g); For the Mascarpone Filling:; 5 large eggs (about 8 3/4 ounces; 245g); 3 1/2 ounces sugar (about 1/2 cup; 100g); 1/4 teaspoon (1g) Diamond Crystal kosher salt; for table salt, use about half as much by volume or the same weight; 24 ounces mascarpone (three 8-ounce containers; 680g), straight from the fridge; To Assemble:; About 30 ladyfingers, store-bought or homemade; Dutch-processed cocoa powder, for dusting