DIRECTIONS

1. STEP 1

   In a large bowl, whisk together yolks and mascarpone until smooth. Add 1 cup sugar; whisk until dissolved. Set aside.

2. STEP 2

   Place biscotti in the bowl of a food processor; pulse for coarse crumbs. Fold biscotti into mascarpone mixture; set aside.

3. STEP 3

   In the bowl of an electric mixer fitted with the whisk attachment, add egg whites; beat until soft peaks form. Fold egg whites into mascarpone mixture; set aside.

4. STEP 4

   Combine espresso and liqueur in a medium bowl; pour half the mixture into a pie plate. Quickly dip half the Ladyfingers individually into the pie plate, and place in the bottom of a 13-by-9-inch glass baking dish; fit snugly to line. Evenly spread half the mascarpone mixture over Ladyfingers; repeat layers.

5. STEP 5

   In a large bowl, whisk together heavy cream and remaining 1 tablespoon sugar until soft peaks form. Spread whipped cream evenly over tiramisu; garnish with grated chocolate. Chill at least 2 hours and preferably overnight before serving.