1/2 cup dried currants
1/2 cup grappa
Place the currants in a small bowl, add the grappa, and set aside to soak for 1 hour.
Preheat the oven to 350 degrees F. Lightly butter and flour a bundt pan.
1 cup packed light brown sugar
1/2 cup granulated sugar
1 1/2 cup cake flour
1/2 cup chestnut flour
1/2 teaspoon ground cloves
1 teaspoon baking soda
1 teaspoon baking powder
1 teaspoon salt
In a large bowl, combine the brown sugar, granulated sugar, cake flour, chestnut flour, cloves, baking soda, baking powder and salt. Mix until well blended.
6 egg yolks
1/2 cup extra virgin olive oil
1/2 cup buttermilk
Add the egg yolks, the oil, and the buttermilk, and using an electric mixer, beat until smooth.
1/2 cup chopped fresh chestnuts
2 shredded Rome apples about 1 1/2 cups (or any soft and tart cooking apple)
Drain the currants, reserving the grappa. Fold the currants, chestnuts and apples into the batter.
6 egg whites
In a separate bowl, beat the egg whites until stiff. Fold the egg whites into the batter, and then pour the batter into the bundt pan. Place the pan in the oven and bake for 1 hour, or until a toothpick inserted into the cake comes out clean.
Remove the pan from the oven and set aside for about 10 minutes. Then invert the cake onto a plate.
2 cups confectioner's sugar
4 teaspoons light corn syrup (or more if needed)
In a small bowl, stir together the confectioner's sugar, 4 teaspoons of the reserved soaking grappa, and the corn syrup until smooth and glossy (if it's too thick to spread, add another teaspoon of corn syrup). Pour the icing over the peak of the cake all around the ring, and allow it to set for 10 minutes.
1 cup mascarpone (at room temperature)
Drink a shot of the remaining grappa in the kitchen before serving the cake with a bowl of the mascarpone on the side.