Instructions

To make the crust:

1. Line a 13- x 9-inch pan with aluminum foil and grease the foil with butter. In a bowl, combine biscotti crumbs and butter. Press into bottom of prepared pan and freeze.

To make the filling:

1. In a mixer bowl fitted with paddle attachment, beat cream cheese, mascarpone cheese, sugar and flour until very smooth, for 3 minutes. Add whole eggs and egg yolks, one at a time, beating after each addition. Mix in wine and vanilla. Preheat the oven to 325 degrees F.
2. Pour over the frozen crust, smoothing out to sides of pan. Bake in a preheated oven until top is light brown and center has a slight jiggle to it, 45 to 55 minutes. Let cool in pan on a wire rack for 2 hours. cover with plastic wrap and refrigerate for at least 6 hours before cutting into bars. Serve with cherry-kirsch sauce or truffle fudge frosting with lots of chocolate shavings.

To make the frosting:

1. In top of double boiler over simmering water, melt milk and bittersweet chocolate, stirring until smooth. Let cool until no longer warm to the touch.
2. In a mixer bowl fitted with whip attachment, beat butter and melted chocolate on medium speed until uniform in color, about 3 minutes. Place bowl in the refrigerator for 10 minutes to firm the frosting. Return to the mixer and beat until fluffy, about 2 minutes.
3. Decorate the cheesecake any way you want it with the frosting!